少量硝酸对316L和Hastelloy C合金在循环废酸中腐蚀机理的影响

中国腐蚀与防护学报

2011, Vol. 31

Issue (2): 121-124

研究报告

本期目录 | 过刊浏览

少量硝酸对316L和Hastelloy C合金在循环废酸中腐蚀机理的影响

郭金彪，陈阵，王璐，张婷

兰州石化公司研究院兰州 730060

EFFECT OF A SMALL CONTENT OF NITRIC ACID ON CORROSION MECHANISM OF 316L & HASTELLOY C ALLOY IN CIRCULAR DISPOSAL ACID

GUO Jinbiao, CHEN Zhen, WANG Lu, ZHANG Ting

The Academy of Lanzhou Petrochemical Company Gansu, Lanzhou 730060

全文: PDF(1238 KB)

摘要: 利用电化学方法、SEM和EDS研究了少量硝酸对316L和Hastelloy C合金在循环废酸中腐蚀机理的影响。结果表明，循环废酸中的少量硝酸能使温度为80℃的循环废酸具有强氧化性，使铁基奥氏体不锈钢316L在循环废酸中形成致密的钝化膜，使其腐蚀速率大幅度降低；使Hastelloy C合金在循环废酸中的钝化膜发生局部溶解，使其腐蚀速率增加。

关键词 ：循环废酸, 腐蚀机理, 316L不锈钢, Hastelloy C合金

Abstract：Due to its excellent corrosion resistance to various media, Hastelloy C alloy has been widely used in chemical and other industries. Circular disposal acid is a kind of strongly corrosion solution which containing 72 mass% H₂SO₄ & 0.5 mass% HNO₃, so Hastelloy C alloy was selected as the material of the circular disposal acid pump in aniline unit. However, the pump made of Hastelloy C alloy was corroded seriously in circular disposal acid. The correlative experiments showed that a small content of nitric acid in the circular has great effect on the corrosion rate of Hastelloy C alloy & 316L. So the effect of a small content of nitric acid on corrosion mechanism of 316L & Hastelloy C alloy in circular disposal acid was studied by using electrochemical method, SEM & EDS techniques. The results showed that a small content of nitric acid can cause the circular disposal acid to have strong oxidizing property, and decreased the corrosion rate of 316L stainless steel in circular disposal acid remarkably by forming compact passive film on the surface of 316L stainless steel, and increased the corrosion rate of Hastelloy C alloy by dissolving the passive film on the surface of Hastelloy C partially.

Key words： circular disposal acid corrosion mechanism 316L stainless steel Hastelloy C alloy

收稿日期: 2010-03-02

ZTFLH:

TG172

通讯作者: 郭金彪 E-mail: guo_jinbiao@sohu.com

作者简介: 郭金彪，男，1979年生，硕士，研究方向为石油化工设备腐蚀与防护

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引用本文:

郭金彪，陈阵，王璐，张婷. 少量硝酸对316L和Hastelloy C合金在循环废酸中腐蚀机理的影响[J]. 中国腐蚀与防护学报, 2011, 31(2): 121-124.
GUO Jin-Biao. EFFECT OF A SMALL CONTENT OF NITRIC ACID ON CORROSION MECHANISM OF 316L & HASTELLOY C ALLOY IN CIRCULAR DISPOSAL ACID. J Chin Soc Corr Pro, 2011, 31(2): 121-124.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2011/V31/I2/121

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