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

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.

Influence of alloying (Cr, Fe, Ni) on the corrosion resistance of layers formed by electron-beam processing

“…The increase in the corrosion resistance of the analyzed materials is explained by the favorable effect of chromium and nickel, as well as the formation of chemically resistant chromium and iron borides in the surface layers [8,26]. Structural features of the surface of the samples after corrosion tests were analyzed using the method of scanning electron microscopy.…”

“…The tests to determine the corrosion resistance of materials were carried out by anodic etching in inhibited sulfuric acid and in an oxidizing environment with weight loss control [20][21][22]. Unmodified steel 12X18H9T was chosen as a standard [8].…”

“…However, one of the problems limiting the use of chromium-nickel austenitic steels as materials for tribological applications is their low resistance to abrasive wear [3][4][5]. A rational solution that makes it possible to significantly improve these characteristics is the application of wear-resistant protective layers to wear surfaces by high-energy methods, for example, non-vacuum electron beam surfacing (EB) of powder mixtures [6][7][8]. However, increasing the strength of the surface layers can lead to a loss of the corrosion resistance of the material [9,10].…”

Structure and properties of HEA-based coating reinforced with CrB particles

“…Для создания конструкционных покрытий из высокоэнтропийных сплавов могут применяться различные технологии, такие как лазерная наплавка [9][10][11], плазменное напыление [12,13] и другие [7]. В настоящей работе для формирования покрытий был использован метод вневакуумной электронно-лучевой наплавки [14], который ранее успешно применялся для формирования защитных по-крытий на нержавеющих сталях [15,16], титане [17] и низкоуглеродистых сталях [18][19][20].…”