Effect of Specific Magnetic Susceptibility of AISI 304 and 08Kh18N10 Steels on Their Limiting Potentials in Chloride-Containing Environments

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
O. E. Narivskyi, G. V. Snizhnoi, T. V. Pulina, V. L. Snizhnoi, N. A. Solidor
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Abstract

The resistance of AISI 304 and 08Kh18N10 steels to crevice corrosion in chloride-containing media was studied using potential-dynamic methods. The preset gap width of 0.3 mm between the sample and the counter body simulates the gap between adjacent plates of plate-like heat exchangers. The area of the hysteresis loop of the constructed anode potential-dynamic curves of the forward and reverse stroke was used to compare the volume of local damage caused by crevice corrosion of the studied steels. The maximum areas of the steel hysteresis loop and the volume of local corrosion damage in the ingots with the lowest (2.23×10–8 and 2.24×10–8 m3/kg) and highest (2.31×10–8 m3/kg) values of the specific paramagnetic susceptibility χ0 of austenite were established. The free corrosion potential Ecorr of steels intensively shifts in the negative direction (from –0.28 up to –0.41), and the repassivation Erp and crevice corrosion Ecrev – in the positive direction from –0.38 up to –0.29 and from –0.1 to 0.1 V, respectively, with an increase in the parameter χ0 from 2.23×10–8 up to 2.25×10–8 m3/kg, which contributes to an increase in their ∆E-criterion from 0.02 up to 0.69 V and resistance to crevice corrosion. This is because, in this range of values, the change in the χ0 parameter is determined by deviations in the content of C, N, S, P, and Cr in the solid solution of austenite in steels. With an increase in the parameter χ0 of steels to 2.31×10–8 m3/kg, their potential Ecorr shifts in the positive direction from –0.41 up to –0.32, and Erp , Ecrev – in the negative direction from 0.29 up to 0.15 and from 0.10 up to –0.02 V, respectively, which contributes to a decrease in the ∆E criterion of steels from 0.65 up to 0.14 V and their resistance to crevice corrosion. The χ0 parameter of steels is an integral characteristic of the paramagnetic state of austenite and can be used to assess their resistance to crevice corrosion in chloride-containing media.

Abstract Image

AISI 304 和 08Kh18N10 钢的特定磁感应强度对其在含氯环境中极限电位的影响
采用电位动力法研究了 AISI 304 和 08Kh18N10 钢在含氯化物介质中的抗缝隙腐蚀性能。试样与台体之间的预设间隙宽度为 0.3 毫米,模拟了板式热交换器相邻板之间的间隙。所构建的正向和反向冲程阳极电位-动态曲线的滞后环面积用于比较所研究钢材的缝隙腐蚀造成的局部损坏体积。确定了奥氏体比顺磁感应强度 χ0 值最低(2.23×10-8 和 2.24×10-8 m3/kg)和最高(2.31×10-8 m3/kg)的钢锭中钢磁滞回线的最大面积和局部腐蚀破坏体积。钢的自由腐蚀电位 Ecorr 向负方向剧烈移动(从 -0.28 到 -0.41),而再钝化 Erp 和缝隙腐蚀 Ecrev 则向正方向移动,分别从 -0.38 到 -0.随着参数 χ0 从 2.23×10-8 m3/kg 增加到 2.25×10-8 m3/kg,它们的 ∆E 标准从 0.02 V 增加到 0.69 V,抗缝隙腐蚀能力也随之增加。这是因为,在这一数值范围内,χ0 参数的变化是由钢中奥氏体固溶体中 C、N、S、P 和 Cr 含量的偏差决定的。随着钢的参数 χ0 增加到 2.31×10-8 m3/kg,其电位 Ecorr 从 -0.41 向正方向移动到 -0.32,Erp , Ecrev - 分别从 0.29 向负方向移动到 0.15 和从 0.10 向负方向移动到 -0.02V,这导致钢的ΔE 标准从 0.65 V 下降到 0.14 V,其抗缝隙腐蚀性能也随之下降。钢的χ0参数是奥氏体顺磁态的一个整体特征,可用于评估钢在含氯化物介质中抗缝隙腐蚀性能。
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来源期刊
Materials Science
Materials Science 工程技术-材料科学:综合
CiteScore
1.60
自引率
44.40%
发文量
63
审稿时长
4-8 weeks
期刊介绍: Materials Science reports on current research into such problems as cracking, fatigue and fracture, especially in active environments as well as corrosion and anticorrosion protection of structural metallic and polymer materials, and the development of new materials.
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