Influence of Chromium Concentration on Corrosion Resistance of Surface Layers of Stainless Steel

Evdokiya Bushueva,Yevgeny Turlo,Galina Khamgushkeeva,N.F Uvarov

doi:10.1051/matecconf/202134001022

Evdokiya Bushueva, Yevgeny Turlo + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/202134001022

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Abstract

Phase transformations occurring during the non-vacuum electron-beam surfacing using a mixture of amorphous boron and chromium powder (from 5 to 30 wt%) as well as the effect of the resulting structure on the corrosion resistance of the surface layers of chromium-nickel austenitic steel have been investigated. It has been found that when processing a powder mixture with a minimum chromium content (5 and 10 wt%), layers with a dense arrangement of borides are formed. Further increase in chromium concentration (20 and 30 wt%) leads to the formation of solid solutions in the modified layer. It has been shown that an increase in the concentration of chromium in the surface layer leads to a twofold increase in the corrosion resistance of the 12Х18Н9T (AISI 302) steel surface.

Highlights

Chromium-nickel steels are highly resistant to corrosion; there are conditions under which these steels can undergo local types of corrosion destruction, in particular, inter crystalline corrosion (ICC) [1,2,3,4]
Surfacing of a powder mixture of amorphous boron and a wetting component Cr (5-30 wt%) at a current of 23 mA leads to the formation of surface layers, which abrasion resistance is 2.5-5 times higher than that of the control material
The high value of wear resistance at chromium concentration of 5 and 10 wt% is explained by the high content of high-strength particles in the modified layer

Summary

Introduction

Chromium-nickel steels are highly resistant to corrosion; there are conditions under which these steels can undergo local types of corrosion destruction, in particular, inter crystalline corrosion (ICC) [1,2,3,4]. The method of anodic etching in inhibited sulfuric acid makes it possible to evaluate the progress of the corrosion process in an accelerated mode. This method is used to control products of chromium-nickel steels; the method is included in Russian standards and is standardized in the ISO system. The objects of research were modified layers obtained by cladding of amorphous boron and various wetting components, formed on chromium-nickel steel

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