Dependence of the Structure of Electrodeposited Binary Coatings Based on Iron on the Parameters of Chemical-Thermal Treatment

Purpose. To study the effect of cyanidation on the structure of electrodeposited iron-tungsten and iron-molybdenum coatings.

Methods. To obtain electrodeposited iron-molybdenum and iron-tungsten coatings, chloride electrolytes of medium concentration were used. Ammonium molybdate (NH₄)₆Mo₇O₂₄∙4H₂O acted as a dopant in the electrolyte in the first case, and sodium tungstate NaWO₄∙4H₂O in the second case. Citric acid C₆H₈O₇ was used as a complexing agent. To carry out the experiments, the electrolyte was prepared from reagents of the chemical grades "HCh" and "ChDA", which were dissolved in distilled water. The acidity of the electrolyte was controlled using a Laboratory PhMeter 766 device. Cyanidation of the coatings was carried out in a pasty medium at temperatures of 873–923 K. The basis of the paste was carbon black and a nitrogen-containing component, in the ratio of 50% soot, 50% yellow blood salt. An organic adhesive was used as a binder.

Results. The maximum microhardness of iron-molybdenum coatings was 8300 MPa. These values were obtained for coatings containing 1.2...1.5% of the alloying element. The microhardness of coatings containing tungsten (1.75... 1.8% W) is at the level of 8250...8300 MPa. According to our data, alloys of electrodeposited iron with molybdenum (1.5% Mo) and tungsten (1. 8%W). The wear resistance of these coatings is much higher than the wear resistance of both pure electrodeposited iron coating and the base metal. The thickness of the studied coatings was 0.3...0.4 mm, the specific load at boundary friction was 7.5 MPa.

Conclusion. Cyaniding of electrodeposited alloyed iron makes it possible to obtain carbonitride layers of considerable thickness, having a hardness of up to 13000 MPa, as well as high wear resistance (5-6 times higher than the wear resistance of coatings without cyanidation).

The results of the study of cyanidation of electrolytic alloys used in the restoration of worn machine parts served as the basis for the development of a technology for hardening parts, convenient for repair production, which can significantly increase their durability, and, consequently, the reliability of repaired machines.

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