Steel protection inhibitors in electrochemical machining in concentrated sodium chloride solutions

Revenko, V. G.; Паршутин, В. В.; Chernova, G. P.; Богдашкина, Н. Л.

doi:10.1134/s0033173208020057

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“…The anode EPP specificity is a decrease in the surface roughness because of anodic dissolution [8] and the formation of an oxide layer with the protective proper ties. Positive results were obtained for grade 40Kh and 45 medium carbon structural steels under conditions of atmospheric corrosion [9,10] and for grade 304 austenitic and 403 martensitic steels [11]. When cool ing parts in air after nitriding, the diffusion layer struc ture corresponds to that obtained traditionally and contains the nitride zone and the internal nitriding zone [12].…”

Section: Introductionmentioning

confidence: 91%

Features of nitroquenching of medium-carbon steel during anodic electrolyte–plasma processing

Кусманов

Смирнов

Белкин

2016

Prot Met Phys Chem Surf

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The research described in this paper is devoted to short term anodic nitriding of grade 45 steel with postquenching (nitroquenching) in the aqueous solution of ammonia and ammonia chloride. The mod ified layer structure, as revealed, is composed of alternate layers: a surface oxide layer composed of FeO and Fe 3 O 4 ; a layer of dispersed nitrides Fe 4 N and Fe 2-3 N with retained austenite; next, a martensitic zone com posed of nitrogen and carbon; and the initial nitrogen enriched ferrite-pearlitic structure. It is found that concentrations of electrolyte components and processing conditions affect the formation character and prop erties of diffusion layers. The possibility is shown for obtaining a nitroquenched layer 130 μm in thickness with a surface microhardness of to 1200 HV with a decrease in roughness R a from 0.57 to 0.55 μm, R z from 1.75 to 1.62 μm, and R max from 5.74 to 4.00 μm.

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Section: Introductionmentioning

confidence: 91%