300M和<span>Cr9钢在酸性介质中的电化学性能研究</span>

中国腐蚀与防护学报

2012, Vol. 32

Issue (6): 449-454

研究报告

本期目录 | 过刊浏览

300M和Cr9钢在酸性介质中的电化学性能研究

孙敏¹^，肖葵¹，董超芳¹,李晓刚¹,钟平²

1. 北京科技大学腐蚀与防护中心北京 100083

2. 北京航空材料研究院北京 100095

ELECTROCHEMICAL BEHAVIOR OF 300M AND Cr9 STEEL IN ACIDIC ENVIRONMENTS

SUN Min¹, XIAO Kui¹, DONG Chaofang¹, LI Xiaogang¹, ZHONG Ping²

1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083

2. Beijing Institute of Aeronautical Materials, Beijing 100095

全文: PDF(1217 KB)

摘要:

采用动电位极化、电化学阻抗和金相显微技术研究了300M和一种新型超高强度马氏体钢 (简称Cr9钢)在(H₂SO₄+Na₂SO₄)溶液中的腐蚀规律，以及pH值和Cl^-对其腐蚀行为的影响。研究表明，300M和Cr9钢的腐蚀电位E_corr随pH值增大呈升高趋势，电荷转移电阻R_ct减小，腐蚀电流密度I_corr增大。溶液pH值的降低能加速300M和Cr9钢的腐蚀。在无Cl^-的(H₂SO₄+Na₂SO₄)溶液中，300M发生均匀腐蚀，而Cr9钢则表现为点蚀；Cl^-能促进点蚀的发生，使Cr9钢的阳极反应由钝化转变为活化溶解。Cr9钢中Cr、Mo和Ni元素含量的增加能提高其在酸性介质中的耐蚀性，腐蚀速率明显低于300M钢。

关键词 ： 300M, 超高强度钢, 酸性介质, 电化学, 钝化

Abstract：

The electrochemical behavior of 300M and a new kind of ultra high strength steel (Cr9 for short) in sulfate acidic environment, as well as the effects of pH and Cl^- concentration on the corrosion behavior were studied by potentiodynamic polarization curve, EIS, and metallographic microscope. The results showed that with increasing pH value, the corrosion potentials E_corr of 300M and Cr9 shifted towards the positive direction, the charge-transfer resistances R_ct increased, and the corrosion current densities em_corr decreased. The (H₂SO₄+Na₂SO₄) solution with decreasing pH value suppressed the corrosion rates of 300M and Cr9. In the chloride-free sulfate acidic solution, general corrosion on the 300M surface occurred, while on Cr9 surface pitting occurred. The addition of chloride ions induced the pittings and transformed the passivity of Cr9 into an active dissolution state. Cr9 steel contains more contents of Cr, Mo and Ni, and the elements enhanced the corrosion resistance in acidic solution and made a much lower corrosion rate compared with 300M.

Key words： 300M ultrahigh strength steel acidic solution electrochemistry passivity

收稿日期: 2012-01-10

ZTFLH:

TG172.3

基金资助:

中央高校基本科研业务费专项资金 (FRF-TP-11-006B)和国家自然科学基金(51171023)资助

通讯作者: 李晓刚 E-mail: lixiaogang99@263.net

Corresponding author: LI Xiaogang E-mail: lixiaogang99@263.net

作者简介: 孙敏，女，1985年出生，博士生，研究方向为超高强钢的应力腐蚀开裂

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引用本文:

孙敏，肖葵，董超芳,李晓刚,钟平. 300M和Cr9钢在酸性介质中的电化学性能研究[J]. 中国腐蚀与防护学报, 2012, 32(6): 449-454.
SUN Min, XIAO Kui, DONG Chaofang, LI Xiaogang, ZHONG Ping. ELECTROCHEMICAL BEHAVIOR OF 300M AND Cr9 STEEL IN ACIDIC ENVIRONMENTS. Journal of Chinese Society for Corrosion and protection, 2012, 32(6): 449-454.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2012/V32/I6/449

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