不同pH的碱性环境中16Mn钢及热影响区应力腐蚀行为
发布时间：2018-09-04 17:35
【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。
[Abstract]:The stress corrosion cracking (SCC) behavior and mechanism of 16Mn steel and its simulated heat affected zone (HAZ) in alkaline sulfide and Cl- medium of different pH were studied by electrochemical technique and immersion test of U-shaped bend specimen. The results show that the original structure, coarse grain structure (air-cooled structure) and hardened microstructure (quenched structure) of the steel are approximately passivated in alkaline sulfide environment with pH of 11.8.The density of the blunt current decreases in turn, and with the decrease of pH, the initial structure of the steel is approximately passivated. The anodic process of the original and coarse grained microstructure was gradually changed from passivated state to the sclerosing structure in the activated state. The SCC sensitivity of the coarse crystalline structure and the original structure in alkaline sulfide environment decreased in turn, and the hardened microstructure had obvious SCC characteristics. With the decrease of pH, the crack changed from intergranular crack to transgranular and intergranular mixed crack, and the width of crack increased.
【作者单位】： 北京科技大学腐蚀与防护中心;吉林油田公司;
【基金】：国家科技支撑计划项目(2011BAK06B01-01)
【分类号】：TG142.1;TG172.9
[Abstract]:The stress corrosion cracking (SCC) behavior and mechanism of 16Mn steel and its simulated heat affected zone (HAZ) in alkaline sulfide and Cl- medium of different pH were studied by electrochemical technique and immersion test of U-shaped bend specimen. The results show that the original structure, coarse grain structure (air-cooled structure) and hardened microstructure (quenched structure) of the steel are approximately passivated in alkaline sulfide environment with pH of 11.8.The density of the blunt current decreases in turn, and with the decrease of pH, the initial structure of the steel is approximately passivated. The anodic process of the original and coarse grained microstructure was gradually changed from passivated state to the sclerosing structure in the activated state. The SCC sensitivity of the coarse crystalline structure and the original structure in alkaline sulfide environment decreased in turn, and the hardened microstructure had obvious SCC characteristics. With the decrease of pH, the crack changed from intergranular crack to transgranular and intergranular mixed crack, and the width of crack increased.
【作者单位】： 北京科技大学腐蚀与防护中心;吉林油田公司;
【基金】：国家科技支撑计划项目(2011BAK06B01-01)
【分类号】：TG142.1;TG172.9
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