WO2019000447A1 - Silane passivator, metal workpiece and passivation treatment method therefor - Google Patents

Abstract

A silane passivator, a metal workpiece and a passivation film treatment method therefor. The passivator comprises 3-20G/L of alkyl phosphate, 0.2-4G/L of fluorozirconic acid, 0.4-8G/L of nano oxide, 1-10G/L of silane coupling agent and the balance of water. The described silane passivator forms a passivation film on a metal surface, and the passivation film treatment film has good bonding ability, such as to a coating film, as well as strong corrosion resistance.

Description

 Silicon germanium passivating agent, metal workpiece and passivation treatment method thereof

 [0001] The present invention relates to the technical field of metal surface treatment, and in particular to a silane passivating agent, a metal workpiece, and a passivation treatment method thereof.

 Background technique

 [0002] In order to improve the surface properties or appearance of a product, the surface treatment technology of the workpiece is usually applied. For example, the surface treatment of steel, zinc, aluminum, iron and their alloys goes deep into all walks of life. Moreover, most workpieces require pre-treatment before surface treatment, for example, cleaning, decontamination and degreasing, and metalworking parts for certain applications require process passivation.

 [0003] Generally in the mechanical processing and electrical and electronic industries, metals require surface pretreatment before coating, such as passivation solution passivation. Conventional passivating or passivating solutions usually contain hexavalent chromium and trivalent. Heavy metals such as chrome obviously cannot meet the increasingly high environmental requirements.

 technical problem

 [0004] In view of the above, a silane passivating agent having good bonding ability and corrosion resistance and environmental protection is provided, as well as a surface passivation treatment method for a metal workpiece and a metal workpiece obtained by passivation treatment.

 Problem solution

 Technical solution

 [0005] A silane passivating agent comprising the following components: 3-20 G/L alkyl phosphate, 0.2-4 G/L fluorozirconic acid, 0.

 4-8G/L nano-oxide, 1-10G/L silane coupling agent, balance of water.

[0006] A metal workpiece surface passivation treatment comprising the steps of: formulating a silane passivating agent as described above; controlling the passivation solution to have a pH of 2-6, immersing the metal workpiece in the passivation solution After the predetermined daytime treatment, the metal workpiece is washed and dried.

And a metal workpiece whose surface is passivated by a metal workpiece surface passivation film treatment method as described above.

 Advantageous effects of the invention

Beneficial effect [0008] The above silane passivating agent forms a passivation film on the surface of the metal, has good bonding ability with the paint film and has strong corrosion resistance, and the silane passivating agent is a better alternative to the traditional chromium-containing passivating agent, avoiding Heavy metals such as chromium produce environmental pollution and are a new type of material that is energy-saving, environmentally friendly and non-polluting.

Embodiments of the invention

The present invention will be described in detail below with reference to specific embodiments.

 [0010] Embodiments of the present invention provide a silane passivating agent comprising the following components: 3-20 G/L alkyl phosphate, 0.

 2-4G/L fluorozirconic acid, 0.4-8G/L nano oxide, 1-10G/L silane coupling agent, balance of water.

[0011] Preferably, the alkyl phosphate has a weight fraction of 5-15 G/L. Preferably, the parts by weight of the fluorozirconic acid is 1-4 G/L, the parts by weight of the nano-oxide are 2-6 G/L, and the parts by weight of the silane coupling agent are 3-10 G/L. .

 [0012] Preferably, the pH of the silane passivating agent is 2.0-5.0 when hydrazine is used.

 [0013] Among the above silane passivators, alkyl phosphate and fluorozirconic acid are main film-forming components, and silane coupling agents and nano-oxides are used as filling and covering agents to increase the corrosion resistance of the passivated workpiece.

[0014] The embodiment of the present invention further provides a metal workpiece surface passivation film treatment, comprising the following steps: preparing a silane passivating agent as described above; pH value is controlled to 2.0-6.0; immersing the metal workpiece in the passivation solution After the predetermined daytime treatment, the metal workpiece is washed and dried.

[0015] Specifically, the formation is a desired metal workpiece. The metal workpiece is processed by forming the desired metal workpiece. The spray or impregnation of the metal workpiece is carried out for 2-10 minutes, and the spray pressure is 0.8-1.2 kgf/cm 2 . If the pH is out of balance, add the ammonia water and the silane passivator to adjust the pH to the above working range.

 [0016] The silane passivating agent in the embodiment of the invention is a zirconium salt silane treating agent, no heavy metal, low-sludge, suitable for surface treatment and passivation before coating of steel, zinc and aluminum, and can replace phosphating solution and chromizing agent. . The silane passivating agent forms a pale yellow passivation film on the surface of the metal, which has excellent bonding ability and corrosion resistance to the painted film. The passivation film treatment film can be matched to various types of coatings.

 [0017] Embodiments of the present invention also provide a metal workpiece that is passivated by a metal workpiece surface passivating agent as described above to form a passivation of the surface of the metal workpiece.

[0018] Embodiment 1 [0019] The components are mixed in the following parts by weight (total amount of 1000 parts by weight): 3 parts of alkyl phosphate, 0.2 parts of fluorozirconic acid, 0.4 parts of nano-silica, 1 part of silane coupling agent, balance water.

[0020] Treatment method: preparing the silane passivating agent as described above, stirring uniformly; PH value is controlled to 3-4; immersing the aluminum alloy workpiece in the passivation solution, treating the surface of the clean metal workpiece, after 10 minutes After processing

, Wash the metal workpiece, dry.

 [0021] After the above formation into a desired metal workpiece. After the treatment, the surface of the workpiece was observed. The surface of the workpiece had a uniform yellowish passivation layer. The neutral salt spray test of the aluminum parts was not corroded for 24 hours, and the adhesion after painting was very good. The boiled water was tested for 2 hours. No coating peeling off, grade 0.

 Embodiment 2

 [0023] The components are mixed according to the following parts by weight (total amount of 1000 parts by weight): 6 parts of alkyl phosphate, 1 part of fluorozirconic acid, 2 parts of nano-silica, 3 parts of silane coupling agent, balance water.

[0024] Treatment method: preparing the silane passivating agent as described above, stirring uniformly; PH value is controlled to 3-4; immersing the aluminum alloy workpiece in the passivation solution, treating the surface of the clean metal workpiece, after 10 minutes After processing

, Wash the metal workpiece, dry. .

 [0025] After the above formation into a desired metal workpiece. After the treatment, the surface of the workpiece was observed. The surface of the workpiece had a uniform light yellow passivation layer. The neutral salt spray test of the aluminum piece was not corroded for 72 hours, and the adhesion after painting was very good. The boiled water was tested for 2 hours. No coating peeling off, grade 0.

 Embodiment 3

 [0027] The components are mixed in the following parts by weight (total amount of 1000 parts by weight): 12 parts of alkyl phosphate, 2 parts of fluorozirconic acid, 5 parts of nano-silica, 6 parts of silane coupling agent, balance water.

[0028] Treatment method: preparing the silane passivating agent as described above, stirring uniformly; PH value is controlled to 3-4; immersing the aluminum alloy workpiece in the passivation solution, treating the surface of the clean metal workpiece, after 10 minutes After processing

, Wash the metal workpiece, dry.

 [0029] After the above formation into a desired metal workpiece. After treatment, after processing, observe the surface of the workpiece. There is a uniform yellowish passivation layer on the surface of the workpiece. The neutral salt spray test of aluminum parts is not corroded after 96 hours. The adhesion after painting is very good. Test, without any coating shedding, grade 0.

 Embodiment 4

[0031] The ingredients were mixed in the following parts by weight (total amount of 1000 parts by weight): 20 parts of alkyl phosphate, 4 parts Fluorozirconic acid, 8 parts of nano-silica, 10 parts of silane coupling agent, balance of water.

[0032] Treatment method: preparing the silane passivating agent as described above, stirring uniformly; PH value is controlled to 3-4; immersing the aluminum alloy workpiece in the passivation solution, treating the surface of the clean metal workpiece, after 10 minutes After processing

, Wash the metal workpiece, dry.

 [0033] After the above formation into a desired metal workpiece. After the treatment, the surface of the workpiece was observed, and the surface of the workpiece had a uniform yellowish passivation layer. The neutral salt spray test of the aluminum piece was not corroded after 72 hours, and the adhesion after painting was good.

, boiled 2 hours test, no coating peel off, grade 0.

[0034] It should be noted that the present invention is not limited to the above embodiments, and other changes may be made by those skilled in the art according to the creative spirit of the present invention, and the changes according to the creative spirit of the present invention should be It is intended to be included within the scope of the invention as claimed.

Claims

Claim  [Claim 1] A silane passivating agent comprising the following components: 3-20 G/L of a hospital phosphate, 0.2-4 G/L of fluorozirconic acid, 0.4-8 G/L of a nano oxide, 1 -10G/L silane coupling agent, the balance of water.  [Claim 2] The silane passivating agent according to claim 1, wherein the alkyl phosphate has a weight fraction of 5 to 15 G/L. [Claim 3] The silane passivating agent according to claim 1, wherein the weight of the fluorozirconic acid is ί  The number is 1-4G/L. [Claim 4] The silane passivating agent according to claim 1, wherein the nano-oxide is nano silica or nano titanium dioxide in a part by weight of 2-6 G/L. The silane passivating agent according to claim 1, wherein the silane coupling agent has a weight fraction of 3 to 10 G/L. [Claim 6] The silane passivating agent according to claim 1, wherein the alkyl phosphate has a weight fraction of 8-20. [Claim 7] The silane passivating agent according to claim 1, wherein the silane coupling agent is preferably γ-aminopropyltriethoxysilane or bis-[3-(triethoxy) Base) Silylpropyl] tetrasulfide. [Claim 8] The silane passivating agent according to claim 1, wherein the silane passivating agent has a ΡΗ value of from 2.0 to 6.0. [Claim 9] A method for treating a surface passivation film of a metal workpiece, comprising the steps of: formulating the silane passivating agent according to any one of claims 1 to 7; controlling the enthalpy value to be 2.0-6.0; Immerse in the passivation solution, after the predetermined inter-turn treatment, wash the metal workpiece and dry.  [Claim 10] A metal workpiece characterized in that the metal workpiece surface is formed with passivation by the metal workpiece surface passivation film processing method according to claim 9.