SU1708923A1 - Method of treating parts from copper and its alloys from or steels coated therewith - Google Patents

Abstract

The invention relates to a tribo technique; in particular, to methods of applying antifriction coatings, and can be used in mechanical engineering for parts that are subject to increased requirements for backing resistance and wear resistance of contacting surfaces. The purpose of the invention is to improve dung resistance. and wear resistance. Method: surface treatment of parts made of copper, its alloys or parts coated with them includes abrasive grinding on a cast-iron or steel plate and subsequent processing in a solution containing 0.5 to 50 wt.% Ammonium sulfide. 2 tab. G (L

Description

The invention relates to the tribological machinery, in particular to methods for applying anti-friction coatings, and can be used in mechanical engineering for parts that are subject to increased demands on the resistance of the contacting surfaces j loaded by friction.

The purpose of the invention is to increase the wear resistance. And durability of parts.

Before immersion, the parts are abraded on a cast-iron or steel plate, and ammonium sulfide at a concentration of 0.5–5 wt.

In the case of abrasive lapping, small (0.5–5.0 µm) uniformly distributed particles of cast iron or steel of the lapping plate are introduced into the surface of the part. The iron of these particles forms electrochemical vapors with copper of the surface, which, upon immersion in a sulphide solution, activate the sulphidation process. Due to the introduction of pre-lapping operations when processing in a sulphide solution on the surface of the parts, a sulphide layer is formed, more firmly, compared to the prototype, linked to the part and ensuring its greater resistance to corrosion.

The method is carried out as follows. 1 They flew from copper, its alloys or parts coated with them are lapped on a cast-iron or steel plate using abrasive materials, the dispersion of particles of which provides the desired surface roughness, then degreased with gasoline, acetone or ethyl alcohol, dried, immersed in an aqueous solution, containing 0.5–50 wt.% ammonium sulfide at a temperature of not more than 50 ° C “is kept in it for 0.11 min, depending on the required thickness of the sulfide layer. The processes occurring in the proposed processing method were investigated using electron microscopy and semi-quantitative X-ray microanalysis, comparative tests were carried out using the GST-90 and GST axial-piston pump hydrotransmission machined by the proposed method and prototype parts -112. Br010f1 bronze and Lmc KNS 58-3-1,5-1,5-t brass samples were examined on an imsler training machine using a flat pattern - a roller. The roller has a diameter of AO mm made of Qx steel with heat treatment, which simulates a real pair of SHG friction (hydrostatic gear). The wear tests were carried out at a load of 1.0 kN for 60 minutes, the lubrication of the friction zone was carried out with Oil B with a constant flow rate of 120 drops per minute, and three samples were tested for each point. The roughness of the working surface over the Hocj-and all the samples before using it was the same and amounted to 0.6Ra. Non-sulphided samples without abrasive lapping were investigated, i.e. machined with grinding, diamond files, rolled with a roller (making work hardening) and ground on a cast-iron plate, some of which were sulphided by the proposed method. The temperature was measured with a chromel-copel thermocouple. When determining the load of the scuff, the load was measured stepwise with an interval of 0.1 kN. The measurement was made after setting the mode. The results of the study for brass LMts KNS 58-3-1.5-1.5-1 and for bronze BRP1SF1 are summarized in table. 1 and 2 respectively. From the above results it can be seen that the creation of work hardening in the surface layer slightly increases the resistance to endurance and wear resistance of the material. When processing by the proposed method, a qualitatively new type of solid lubricant layer is achieved, i.e. the endurance of the material increases with respect to the untreated (without work hardening and sulfiding) by 30 in temperature, by 60 in load, the wear resistance increased 6 times; in case of slanted but not bearing samples, the resistance to survival increased by 13 in temperature, k6% in load, the wear resistance increased in times. . The use of the proposed method provides an increase in resistance to wear, an increase in wear resistance, a reduction in labor costs for the preparation and quality control of a single-component sulfide solution. The invention of Sprabob processing of parts from copper, its alloys or parts coated with them, including surface treatment in a sulfide-containing solution, characterized in that, in order to improve durability and wear resistance, before processing in a solution, abrasive grinding on the cast-iron or steel plate is carried out, and subsequent the treatment is carried out in a solution containing 0.5-50 wt. ammonium sulfide.

Table

2 3 Bronze treated with diamond over 387 1.9 philem k Bronze, rolled by roller (work hardening, nna) 395 1.95 5 Bronze, lapped 397 1.78 on the cast-iron plate 6 Bronze without lapping sulphided 05 1.95 to 7 Bronze ground sulphide "ni 1, 73 8 Bronze, treated with a diamond file, sulfidi. Continuation of volume 2,

i.i ... l ...... l .... i.L.j: 6.0 88.386 .1B. H 6 89.6 Irregularly 38.21.0 5 loose 6.2 90.1 1.1

Claims (1)

Claim Method for processing parts from copper, its alloys or parts coated with them, including surface treatment in a sulfide-containing solution, characterized in that, p. In order to increase the scoring resistance and wear resistance, before processing in the solution, abrasive grinding is carried out on a cast iron or steel plate, and subsequent processing is carried out in a solution containing 0.5-50 wt.% ammonium sulfide. Table Experience Type of sample processing Badass temperature ° C Bully load kN Well Width, mm Wear, mg Layer thickness, microns Layer nature 1 Brass without grinding 345 1.68 8 148.1 - - 2 Polished brass 351 1.73 7.9 140.2 - - 3 Diamond filed brass 349 1.65 7.7 139.5 _| 4 Rolled brass (riveted) • 360 1.74 7.5 136.3 5 Brass lapped on a cast iron stove 396 1.85 7 119.6 - - 6 Sulphidated brass without grinding 398 1.87 6 85.5 .0.5 Discrete 7 Polished Sulphidated Brass 390 1.89 6.8 94.3 / 0.5 Discrete 8 Sulphidated brass treated with diamond file 395 1.91 6.5 107 0.5 Discrete 9 Rolled sulphidated brass 400 2.01 6.3 100.1 0.7 Discrete 10 Sulphidated brass by the proposed method 450 2.71 3,5 28,2 2.6 Dense solid solid associated with the basics. A C Table 2 Experience Type of sample processing Scoring temperature, ° C Scoring load, kN Well Width, mm Wear, mg Layer thickness, microns Layer nature t 1 2 3 4 5 6 7 8 1 Bronze without grinding 385 1.73 7 117.2 - - 2 Polished bronze 390 1.89 6.5 91.3 - 1 1708923 ' ⁸ Continuation of m ^ bl. 2. 1 ......1 ³ 1 4 1 [..l ... | 6 | eleven 8 3 Bronze image of Betana with diamond file 387 1.9 6.0 88.3 - 4 Rolled bronze (riveted) 395 1.95 5.5 86.1 5 Bronze ground on a cast iron stove 397 1.78 6 89.6 - - 6 Sulphidated bronze without grinding 405 1.95 5 38,2 1,0 Unevenly loose 7 Polished sulfonated bronze 401 1.73 6.2 90.1 1,1 .eleven. 8 Sulphidated diamond filed bronze / 405 1.77 5.5 88.7 0.95 .eleven. 9 Rolled sulfonated bronze 410 1.98 5.0. 73.1 about 9 10 Bronze sulfidized by the proposed method 480 3.02 2,5 18,4 2.9 Dense solid firmly bound to the basics. _A. Editor N. Compiled by N. Rygalin Kishtulinets Tehred M.Dndyk Proofreader A. Obruchar Order 407 Circulation Subscribed VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Plant ’’ Pateit * ’, Uzhgorod, st. Gagarina ^ 101