含铜430不锈钢在模拟生理盐水环境下的耐蚀性能研究

闫星宇, 邹德宁, 李苗苗, 张英波, 李雨浓

doi:10.16577/j.issn.1001-1560.2023.0262

材料保护 >

2023 , Vol. 56 >Issue 11: 45 - 52

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0262

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含铜430不锈钢在模拟生理盐水环境下的耐蚀性能研究

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西安建筑科技大学冶金工程学院

邹德宁(1964-),教授,研究方向为高性能不锈钢材料成分设计、组织表征及工艺优化,电话:18991165516,E-mail:zoudening@sina.com

收稿日期: 2023-05-21

修回日期: 2023-06-20

录用日期: 2023-07-15

网络出版日期: 2023-12-25

基金资助

国家自然科学基金面上项目(51774226);山西省科技重大专项(20191102006)资助

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Study on Corrosion Resistance of 430 Stainless Steel Containing Copper under Simulated Normal Saline Environment

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(School of Metallurgy and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China)

Received date: 2023-05-21

Revised date: 2023-06-20

Accepted date: 2023-07-15

Online published: 2023-12-25

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摘要

为研究含Cu 430不锈钢在生理盐水环境下的腐蚀行为,采用电化学测试方法研究了含Cu 430铁素体不锈钢在模拟生理盐水(质量分数0.9%NaCl)溶液中的耐蚀性能,同时,利用Mott-Schottky曲线和X射线光电子能谱(XPS)对钝化膜的半导体特性和表面成分进行了表征,并借助扫描电镜(SEM)观察了电化学腐蚀后的表面形貌。结果表明,在0.9%的NaCl溶液中,不含Cu和含1.57%Cu(质量分数)的430铁素体不锈钢表面均产生了钝化膜。与不含Cu相比,含1.57%Cu的不锈钢耐蚀性降低。Cu元素对430铁素体不锈钢钝化膜中Cr2O3的形成有抑制作用,从而提高了钝化膜中的缺陷密度。加入Cu元素后,430铁素体不锈钢点蚀坑主要分布在富铜相附近,富铜相破坏了钝化膜的连续性,致使耐蚀性下降,不锈钢表面形貌破坏程度增大。

关键词： 430铁素体不锈钢; 1.57%铜; 电化学; 钝化膜; 耐蚀性

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闫星宇, 邹德宁, 李苗苗, 张英波, 李雨浓 . 含铜430不锈钢在模拟生理盐水环境下的耐蚀性能研究[J]. 材料保护, 2023 , 56(11) : 45 -52 . DOI: 10.16577/j.issn.1001-1560.2023.0262

Abstract

In order to study the corrosion behavior of copper-containing 430 stainless steel in normal saline environment, the corrosion resistance of ferritic stainless steel containing Cu 430 in simulated physiological saline solution (0.9% NaCl, mass fraction, the same below) was studied using electrochemical testing methods. The semiconductor properties and surface composition of the passivation film were characterized using Mott-Schottky curves and X-ray photoelectron spectroscopy (XPS), and the surface morphology after electrochemical corrosion was observed using scanning electron microscopy (SEM). Results showed that in 0.9% NaCl solution, passive films were formed on the surface of 430 ferritic stainless steel without Cu and with 1.57% Cu. Compared with stainless steel without Cu, the corrosion resistance of 1.57% Cu stainless steel was reduced. Because Cu element inhibited the formation of Cr2O3 in the passivation film of 430 ferritic stainless steel, the defect density in the passivation film increased. Additionally, the pitting corrosion pits of 430 ferritic stainless steel were mainly distributed near the copper-rich phase after adding the copper element, and the copper-rich phase destroyed the continuity of the passive film, resulting in the decrease of corrosion resistance and the increase of surface morphology damage of stainless steel.

Key words： 430 ferritic stainless steel; 1.57% Cu; electrochemistry; passivation membrane; corrosion resistance

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