不同pH的碱性环境中16Mn钢及热影响区应力腐蚀行为

doi:10.11868/j.issn.1001-4381.2015.03.006

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摘要

利用电化学技术和U形弯试样浸泡实验研究了16Mn钢及其模拟热影响区(HAZ)在不同pH的碱性硫化物和Cl^-介质中的应力腐蚀开裂(SCC) 行为与机理。结果表明:16Mn钢原始组织、粗晶组织(空冷组织)和硬化组织(淬火组织)在pH为11.8的碱性硫化物环境中均近似呈钝化状态,维钝电流密度依次降低;随着pH的降低,原始组织和粗晶组织的阳极过程逐渐由钝化态转变为活化态;HAZ中硬化组织、粗晶组织和原始组织在碱性硫化物环境下的SCC敏感性依次降低,其中硬化组织具有明显的SCC特征;随着pH的降低,SCC裂纹有从沿晶裂纹转变为穿晶和沿晶混合裂纹的趋势,并且裂纹的宽度增加。

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	郝文魁
	刘智勇
	马岩
	杜翠薇
	李晓刚
	胡山山

关键词 ： 16Mn钢, 应力腐蚀开裂, 碱性, 硫化物, pH值

Abstract：

The behavior and mechanism of stress corrosion cracking (SCC) of 16Mn steel and its heat-affected zone (HAZ) in alkaline sulfide and Cl^-solution medium with different pH value was investigated by U-bent specimen immersing test and electrochemical technology. Results show that the original microstructure, the coarse grain structure (air cooling structure) and the hardening microstructure (quenching structure) exhibit a similar passivation state in alkaline sulfide solution with pH=11.8, passive current density gradually decreases; As pH value decreases, anodic process of original structure and coarse grain structure gradually change from the passivation state to the activation state. The SCC susceptibility of the hardening structure, coarse grain structure and original structure of heat-affected zone(HAZ) in alkaline sulfide environment gradually decreases, the hardening structure exhibits obvious SCC feature. With the decrease of pH, SCC cracks tend to change from intergranular cracks to transgranular and intergranular combined cracks and the width of the cracks increases.

Key words： 16Mn steel stress corrosion cracking alkaline sulfide pH value

收稿日期: 2013-06-25 出版日期: 2015-03-20

基金资助:国家科技支撑计划项目(2011BAK06B01-01)

通讯作者: 刘智勇 E-mail: liuzhiyong7804@126.com

作者简介: 刘智勇(1978-),男,副教授,研究方向:材料腐蚀与防护,联系地址:北京市海淀区学院路30号北京科技大学腐蚀与防护中心502(100083),E-mail:liuzhiyong7804@126.com

引用本文:

郝文魁, 刘智勇, 马岩, 杜翠薇, 李晓刚, 胡山山. 不同pH的碱性环境中16Mn钢及热影响区应力腐蚀行为[J]. 材料工程, 2015, 43(3): 28-34.
Wen-kui HAO, Zhi-yong LIU, Yan MA, Cui-wei DU, Xiao-gang LI, Shan-shan HU. Stress Corrosion Cracking Behavior of 16Mn Steel and Heat-affected Zone in Alkaline Sulfide with Different pH Value. Journal of Materials Engineering, 2015, 43(3): 28-34.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.03.006 或 http://jme.biam.ac.cn/CN/Y2015/V43/I3/28

Table 1 实验用16Mn钢化学成分(质量分数/%)

Fig.1 16Mn钢及其热影响区(HAZ)显微组织的金相照片
(a)原始组织；(b)空冷组织；(c)淬火组织

Fig.2 pH =7.8时16Mn钢及其HAZ的电化学行为
(a)EIS的Nyquist图；(b)极化曲线

Fig.3 pH=10时16Mn钢及其HAZ电化学行为
(a)EIS的Nyquist图；(b)极化曲线

Fig.4 pH=11.8时16Mn钢及其HAZ电化学行为
(a)EIS的Nyquist图;(b)极化曲线

Fig.5 pH=11.8时16Mn钢及其HAZ裂纹形貌
(a)原始组织;(b)空冷组织;(c)淬火组织

Fig.6 不同pH条件下发生SCC的样品数量

Fig.7 16Mn钢淬火组织裂纹扩展形貌
(a)pH=11.8;(b)pH=10;(c)pH=7.8

Fig.8 16Mn钢及其HAZ碱性硫化物溶液中的等效电路图

Fig.9 16Mn钢及其HAZ碱性硫化物溶液中R_f

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