Effect of Mo content on microstructure and corrosion  resistance of 9Cr18Mo steel

doi:10.13251/j.issn.0254-6051.2023.12.040

Abstract

Abstract: Microstructure and corrosion resistance of the 9Cr18Mo steel with four different Mo contents were studied by microstructure analysis, electrochemical test and neutral salt spray test, then the influence mechanism of Mo on the corrosion resistance was discussed. The results show that the 9Cr18Mo steel with different Mo contents has a large number of chromium-rich carbides, and the size, quantity and hardness of carbides increase with the increase of Mo content. When the Mo content is less than 0.5%, the corrosion potential increases with the increase of Mo content, but decreases when the Mo content reaches 0.7%. After 120 h neutral salt spray test, the corrosion rate of 0.5Mo tested steel is low. The decrease of pitting corrosion resistance of the specimen containing 0.7% Mo is related to the formation of chromium-rich carbides and the formation of chromium-poor zone near the interface between the carbide and matrix.

Key words: 9Cr18Mo steel, Mo content, corrosion potential, pitting, corrosion resistance

CLC Number:

TG124.24

Zhou Jian, Pian Liping, Fang Feng, Chi Hongxiao, Ma Dangshen. Effect of Mo content on microstructure and corrosion resistance of 9Cr18Mo steel[J]. Heat Treatment of Metals, 2023, 48(12): 244-249.

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Effect of Mo content on microstructure and corrosion resistance of 9Cr18Mo steel

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