16MnR钢在催化裂化再生环境中的应力腐蚀开裂研究

doi:10.11902/1005.4537.2013.050

中国腐蚀与防护学报

2014, Vol. 34

Issue (1): 59-64 DOI: 10.11902/1005.4537.2013.050

本期目录 | 过刊浏览

16MnR钢在催化裂化再生环境中的应力腐蚀开裂研究

邢云颖, 刘智勇(

), 董超芳, 李晓刚

北京科技大学腐蚀与防护中心北京 100083

Stress Corrosion Cracking of 16MnR Steel in FCCU Regeneration Environments

XING Yunying, LIU Zhiyong(

), DONG Chaofang, LI Xiaogang

Corrosion and Protection Center University of Science and Technology Beijing, Beijing 100083, China

全文: PDF(3250 KB) HTML

摘要:

通过U形试样应力腐蚀实验、电化学极化曲线等方法,在模拟催化裂化再生器环境条件下,研究了HNO₃-H₂SO₄-H₂O体系中16MnR钢及其焊缝的应力腐蚀行为。结果表明：16MnR钢焊接接头在不同实验条件下均比基材更易产生硝酸盐应力腐蚀开裂,其机理主要是阳极溶解；引入硫酸根和降低pH值均能破坏16MnR钢的保护膜,增大其焊接接头的应力腐蚀敏感性；当溶液的pH值降低至2以下时,材料处于活化状态,发生严重的均匀腐蚀。

关键词 ：催化裂化, 露点, 16MnR钢, 焊缝, 应力腐蚀

Abstract：

The stress corrosion behavior of the weld seam and base metal of 16MnR steel in solution of HNO₃-H₂SO₄-H₂O, one of the typical environments of FCCU regenerator, was investigated using U-bend specimen immersion test and electrochemical polarization curves. The results show that the weld seam of 16MnR is more sensitive to nitrate stress corrosion cracking than base metal, its mechanism is anodic dissolution. Both the introduction of sulfate and the slightly reduction of pH can destroy the protective film on 16MnR steel, and increase the corrosion susceptibility of its weld seam. However, when the pH of solution is less than 2, the material is in active state, resulting in a serious of uniform corrosion. Besides the effective methods to slow down the stress corrosion of materials in catalytic cracking regenerator are analyzed in this article.

Key words： catalytic cracking dew-point 16MnR weld seam stress corrosion

收稿日期: 2013-06-06

ZTFLH:

TG172.6

基金资助:国家科技支撑计划项目 (2011BAK06B01-01-02);中央高校基本科研业务费专项资金项目 (FRF-TP-12-148A) 资助

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引用本文:

邢云颖, 刘智勇, 董超芳, 李晓刚. 16MnR钢在催化裂化再生环境中的应力腐蚀开裂研究[J]. 中国腐蚀与防护学报, 2014, 34(1): 59-64.
Yunying XING, Zhiyong LIU, Chaofang DONG, Xiaogang LI. Stress Corrosion Cracking of 16MnR Steel in FCCU Regeneration Environments. Journal of Chinese Society for Corrosion and protection, 2014, 34(1): 59-64.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.050 或 https://www.jcscp.org/CN/Y2014/V34/I1/59

图1 16MnR钢焊接接头组织形貌

图2 催化裂化再生环境下应力腐蚀模拟实验装置

图3 腐蚀后试样的宏观形貌和发生的应力腐蚀裂纹形貌

图4 试样表面应力腐蚀裂纹微观形貌

图5 70 ℃下于不同浓度溶液中16MnR钢基体和焊接接头的极化曲线

图6 温度对16MnR钢焊接接头在10%NH4NO3溶液中极化行为的影响

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