CN1060538C - Corrosion-inhibition of iron and steel in tap water - Google Patents
Corrosion-inhibition of iron and steel in tap water Download PDFInfo
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- CN1060538C CN1060538C CN97123364A CN97123364A CN1060538C CN 1060538 C CN1060538 C CN 1060538C CN 97123364 A CN97123364 A CN 97123364A CN 97123364 A CN97123364 A CN 97123364A CN 1060538 C CN1060538 C CN 1060538C
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- Prior art keywords
- tap water
- corrosion inhibitor
- corrosion
- steel
- inhibitor
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- 239000010959 steel Substances 0.000 title claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 29
- 239000008399 tap water Substances 0.000 title claims abstract description 27
- 235000020679 tap water Nutrition 0.000 title claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title 2
- 229910052742 iron Inorganic materials 0.000 title 1
- 238000005260 corrosion Methods 0.000 claims abstract description 65
- 230000007797 corrosion Effects 0.000 claims abstract description 64
- 239000003112 inhibitor Substances 0.000 claims abstract description 38
- 230000005764 inhibitory process Effects 0.000 claims abstract description 19
- MFXMOUUKFMDYLM-UHFFFAOYSA-L zinc;dihydrogen phosphate Chemical compound [Zn+2].OP(O)([O-])=O.OP(O)([O-])=O MFXMOUUKFMDYLM-UHFFFAOYSA-L 0.000 claims abstract description 12
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 10
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 9
- NHFDKKSSQWCEES-UHFFFAOYSA-N dihydrogen phosphate;tris(2-hydroxyethyl)azanium Chemical compound OP(O)(O)=O.OCCN(CCO)CCO NHFDKKSSQWCEES-UHFFFAOYSA-N 0.000 claims description 13
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 239000011787 zinc oxide Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 1
- 238000002360 preparation method Methods 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000003381 stabilizer Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- AFFBBDIUDXTSOK-UHFFFAOYSA-N 2-[bis(2-hydroxyethyl)amino]ethanol;carbonic acid Chemical compound OC(O)=O.OCCN(CCO)CCO AFFBBDIUDXTSOK-UHFFFAOYSA-N 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 229910019142 PO4 Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- 239000010452 phosphate Substances 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 230000004580 weight loss Effects 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229920000388 Polyphosphate Polymers 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 239000001205 polyphosphate Substances 0.000 description 2
- 235000011176 polyphosphates Nutrition 0.000 description 2
- 150000005846 sugar alcohols Polymers 0.000 description 2
- 239000012085 test solution Substances 0.000 description 2
- 229910000368 zinc sulfate Inorganic materials 0.000 description 2
- 239000011686 zinc sulphate Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052816 inorganic phosphate Inorganic materials 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- -1 polyol phosphate Chemical class 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910006297 γ-Fe2O3 Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The present invention relates to a novel corrosion inhibitor and a preparation method of the mixed liquor thereof. The corrosion inhibitor is the corrosive restraint of steel in tap water, and 50 ppm to 250 ppm of novel inhibitor is added to a tap water medium. The inhibitor is prepared from 55% to 65% of sodium tripolyphosphate, 15% to 25% of carbonic acid triethanolamine and 15% to 25% of zinc dihydrogen phosphate. Multiple protective films can be formed at the steel surface in the tap water, and the novel corrosion inhibitor has self-repair capacity when the film is broken. Thereby, the present invention has effective effect on inhibiting steel corrosion, the inhibition rate is as high as 100%, and raw materials are cheap and innoxious. At the same time, the present invention also has certain anti-scale function and can be used as a water-quality stabilizer.
Description
The invention relates to the field of chemistry, in particular to a novel corrosion inhibitor (XM-101 for short) for inhibiting corrosion of steel in tap water, a preparation method and application thereof.
The chemical corrosion inhibitor method is not only effective in inhibiting the corrosion of steel in tap water, but also simple and convenient. The corrosion inhibitors used in this process are of a wide variety, such as: phosphorus-based, molybdenum-based, all organic-based, silicate-based, and the like. The phosphorus corrosion inhibitor has the advantages of high corrosion inhibition rate, small dosage, cheap and easily available raw materials, low cost, no toxicity and the like, and is paid much attention and paid attention to by people. The water quality stabilizer with the trade name of PC-602 is a phosphorus corrosion inhibitor with certain scale inhibition function (Chinese journal of Corrosion and protection 1988, 8 (1): 59-63]. It is composed of polyol phosphate, polyol polyphosphate, polyphosphate and orthophosphate. At a concentration of 300ppm, for A3The corrosion inhibition rate of the steel is as high as 98% (weight loss method). Although PC-602 is representative, the dosage is larger, and the corrosion inhibition rate is still to be further improved.
The invention aims to solve the defects of large dosage and insufficient corrosion inhibition rate of PC-602, and develops and discloses a novel similar corrosion inhibitor with smaller dosage and higher corrosion inhibition rate compared with PC-602, a preparation method and application thereof.
To achieve the purpose, the technical route adopted by the invention and the action principle thereof are as follows: (1) the novel corrosion inhibitor has a certain scale inhibition function by taking sodium tripolyphosphate which has both corrosion inhibition and scale inhibition as a main component. (2) Firstly, the zinc dihydrogen phosphate with hydrolyzability is introduced into the formula. Zinc dihydrogen phosphate and sodium orthophosphate or ZnSO4Has more advantages than before. The zinc dihydrogen phosphate has hydrolyzability and can form insoluble Zn at the cathode reaction position of the steel surface in tap water3(PO4)2Depositing a film which bonds well to the substrateAnd (7) fixing. Sodium orthophosphate or ZnSO alone4There is no such property. Zinc dihydrogen phosphate can be ionized in tap water, and phosphate radical can dissolve O2With Fe under the synergistic effect of++Reaction to form insoluble FePO on the surface of steel4Deposition film, which acts like sodium orthophosphate, Zn++Possibly with Zn (OH)2Form a cathode type precipitation film on the surface of steel, the film is not firm but can increase the efficiency, and the function of the film is combined with ZnSO4The same is true. (3) The triethanolamine phosphate synthesized by the molecular cutting method further enhances the synergistic effect between the alcohol amine group and the phosphate radical. Because the corrosion inhibition performance of the alcohol amine group is stronger than that of the polyalcohol group, the adopted triethanolamine phosphate is better than that of polyalcohol phosphate. Dissolving of triethanolamine phosphate in O2Under the synergistic effect of the components, the surface shape of the steel in tap water can be ensuredTo phosphoric acid triethanolamine, gamma-Fe2O3、Fe3O4And FePO4Meanwhile, the triethanolamine phosphate has a plurality of branched chains, so that the film has self-repairing capability when being damaged. In addition, the corrosion inhibition effect can be greatly improved by compounding triethanolamine phosphate and inorganic phosphate. (4) And the optimized combination is achieved through a compounding test. Experiments show that: the sodium tripolyphosphate, the zinc dihydrogen phosphate and the triethanolamine phosphate are perfectly matched as a whole (XM-101) for the first time, have very obvious synergistic effect and are particularly effective in inhibiting the corrosion of steel in tap water.
The XM-101 corrosion inhibitor of 50ppm to 250ppm is added into the tap water medium, so that the corrosion of steel in the tap water can be effectively inhibited. The corrosion inhibitor is composed of 55-65% of sodium tripolyphosphate, 15-25% of zinc dihydrogen phosphate and 15-25% of triethanolamine phosphate. The mixture of the three components is preferably added in the form of a solution, the total content being 100 mg/ml.
The triethanolamine phosphate and the zinc dihydrogen phosphate in the corrosion inhibitor can be represented by the following reaction formula
The preparation method of the XM-101 corrosion inhibitor mixed solution comprises the steps of firstly taking a proper amount ofwater, adding phosphoric acid and triethanolamine with calculated amounts, fully stirring, standing for a moment, adding zinc oxide with calculated amounts, continuously stirring until the zinc oxide is completely dissolved, then adding sodium tripolyphosphate with calculated amounts, stirring until the zinc oxide is completely dissolved, finally supplementing water, and uniformly stirring to obtain the corrosion inhibitor mixed solution meeting the requirements.
According to the weight of the tap water medium and the required optimal inhibition concentration of the corrosion inhibitor, the dosage of the corrosion inhibitor mixed solution can be calculated, and then the corrosion inhibitor mixed solution is added into the tap water medium and is uniformly stirred for use.
When the concentration of the XM-101 tap water medium corrosion inhibitor is 75ppm, the weight loss method is used for measuring the corrosion inhibitor to A3The corrosion inhibition rate of the steel is as high as 100%. Compared with PC-602, XM-101 dose is only 1/4 of PC-602, and the corrosion inhibition rate is 2% higher, reaching the full scale. Obviously, XM-101 has corrosion inhibition performance far superior to PC-602.
The main characteristics of XM-101 are: (1) high efficiency. (2) The dosage is small, the raw materials are cheap and easy to obtain, and the cost is low. (3) The raw materials are nontoxic. (4) Has certain scale inhibiting function and may be used as water quality stabilizer.
Example 1 test solutions tap water without corrosion inhibitor and with 60% tripolyphosphateXM-101 tap water medium corrosion inhibitor prepared from sodium, 20% triethanolamine phosphate and 20% zinc dihydrogen phosphate (weight percentage) is 75ppm tap water. Test Material A3Steel with a gauge of 5X 2.5X 0.2 cm and a surface area of 28cm2. All the samples are polished step by metallographic abrasive paper, then washed by tap water and absolute alcohol, dried by cold air, and placed in a dryer for more than 24 hours for later use.
The test adopts a weight loss method, the sample is soaked in the test solution for 1800 hours after being weighed, the taken sample is processed and weighed according to the GB 6384-86 method, and the corrosion rate upsilon of the steel sample is calculated according to the following formula (3), namely
υ(mm／y)=8．76×104X △ w/s x t x ρ … … (3) wherein:△ w is the weight loss (g) of the steel sample, S is the surface area (cm) of the steel sample2) T is the soaking time (h), and rho is the steel density (g/cm)3)。
Then calculating the corrosion inhibitor pair A according to the following formula (4)3Inhibition rate E of steel, i.e.
E(％)=(υo—υc)／υoX 100 … … (4) wherein: upsilon isoCorrosion rate upsilon of steel sample without corrosion inhibitorcThe steel-like corrosion rate for a given corrosion inhibitor.
The test results were as follows: when the concentration of the corrosion inhibitor is 75ppm, for A3The corrosion inhibition rate of the steel is 100%. The steel sample is bright as before, and macroscopic corrosion is not seen.
Example 2, procedure as above, for A, when XM-101 corrosion inhibitor concentration is 150ppm (component ratio as above)3The corrosion inhibition rate of the steel is 99.73%. The steel sample is bright and has no macroscopic corrosion.
Claims (4)
1. A corrosion inhibitor for inhibiting corrosion of steel in tap water is characterized in that: the tap water medium corrosion inhibitor is composed of sodium tripolyphosphate, triethanolamine phosphate and zinc dihydrogen phosphate, and the proportion (weight ratio) of the sodium tripolyphosphate, the triethanolamine phosphate and the zinc dihydrogen phosphate is as follows:
55-65% of sodium tripolyphosphate;
15-25% of triethanolamine phosphate;
15-25% of zinc dihydrogen phosphate.
2. The corrosion inhibitor of claim 1 for inhibiting corrosion of steel in tap water, wherein: the inhibition concentration of the tap water medium corrosion inhibitor is 50ppm to 250 ppm.
3. A method of preparing the corrosion inhibitor for inhibiting corrosion of steel in tap water according to claim 1, characterized in that: firstly, adding a proper amount of water into phosphoric acid and triethanolamine in calculated amount, fully stirring, standing for a moment, adding zinc oxide in calculated amount, continuously stirring until the zinc oxide is completely dissolved, then adding sodium tripolyphosphate in calculated amount, stirring until the zinc oxide is completely dissolved, finally supplementing water, and uniformly stirring to obtain the corrosion inhibitor mixed liquid meeting the requirements.
4. A method of using the corrosion inhibitor of claim 1 for inhibiting corrosion of steel in tap water, characterized by: the mixture of the three components of the tap water medium corrosion inhibitor is prepared into a solution for use, and the total content is 100 mg/ml.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97123364A CN1060538C (en) | 1997-12-08 | 1997-12-08 | Corrosion-inhibition of iron and steel in tap water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97123364A CN1060538C (en) | 1997-12-08 | 1997-12-08 | Corrosion-inhibition of iron and steel in tap water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1219608A CN1219608A (en) | 1999-06-16 |
| CN1060538C true CN1060538C (en) | 2001-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97123364A Expired - Fee Related CN1060538C (en) | 1997-12-08 | 1997-12-08 | Corrosion-inhibition of iron and steel in tap water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1060538C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7632458B2 (en) * | 2006-01-31 | 2009-12-15 | General Electric Company | Corrosion inhibitor treatment for closed loop systems |
| CN102465300B (en) * | 2010-11-10 | 2013-05-15 | 中国科学院生态环境研究中心 | Corrosion inhibitor for cast iron in tap water containing sulfate and chloride ions |
| CN115613034B (en) * | 2022-11-15 | 2024-09-20 | 鲁西化工集团股份有限公司煤化工一分公司 | Process for weakening bottom corrosion of water cooling tower of air separation device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069529A (en) * | 1992-08-20 | 1993-03-03 | 中国石油化工总公司 | The high temperature oil phase corrosion inhibitor |
| CN1111683A (en) * | 1995-04-19 | 1995-11-15 | 何秋霞 | Corrosion inhibitor for corrosion system of HCl-H2S-H2O |
| CN1144780A (en) * | 1996-08-09 | 1997-03-12 | 北京北方大康科贸有限责任公司 | High-efficiency quick descaling agent for cleaning water scale on vehicle radiator inner wall |
-
1997
- 1997-12-08 CN CN97123364A patent/CN1060538C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069529A (en) * | 1992-08-20 | 1993-03-03 | 中国石油化工总公司 | The high temperature oil phase corrosion inhibitor |
| CN1111683A (en) * | 1995-04-19 | 1995-11-15 | 何秋霞 | Corrosion inhibitor for corrosion system of HCl-H2S-H2O |
| CN1144780A (en) * | 1996-08-09 | 1997-03-12 | 北京北方大康科贸有限责任公司 | High-efficiency quick descaling agent for cleaning water scale on vehicle radiator inner wall |
Non-Patent Citations (1)
| Title |
|---|
| 中国腐蚀与防护学报1988,8(1) 1998.8.1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1219608A (en) | 1999-06-16 |
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