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Assessment of pH and temperature effects on stress corrosion cracking of 1018 low carbon steel

机译：pH和温度对1018低碳钢应力腐蚀开裂的影响评估

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Stress corrosion cracking tests (SCC) were performed on 1018 low carbon steel into 0-5M NaCl solution at different pH values and temperatures of 25, 50 and 70℃ using the slow strain rate testing technique. Evaluations were complemented with hydrogen permeation measurements and electrochemical impedance spectroscopy. Studies show hydrogen diffusion effects depending on temperature and pH. The maximum hydrogen diffusion was observed at 70℃ (pH<1). The SCC susceptibility was measured as the percentage reduction in area and the time to failure and was maximal at pH<1 at the temperatures studied. The most likely mechanism for the cracking susceptibility of 1018 steel in the chloride solutions seems to be hydrogen assisted anodic dissolution assisted by hydrogen embrittlement. After failure, the fracture surfaces were observed by scanning electron microscopy and chemical analysis was obtained by X-ray energy dispersive spectroscopy. The specimens tested in air exhibited a ductile type of failure, whereas, in the corrosive solution the specimens showed a brittle fracture.
机译：使用慢应变速率测试技术，在1018低碳钢在0、5M NaCl溶液中，不同pH值以及25、50和70℃的温度下进行应力腐蚀开裂测试（SCC）。评估还辅之以氢渗透测量和电化学阻抗谱。研究表明氢扩散效应取决于温度和pH值。在70℃（pH <1）下观察到最大的氢扩散。 SCC敏感性以面积减少的百分比和失效时间来衡量，并且在所研究的温度下在pH <1时最大。 1018钢在氯化物溶液中开裂敏感性的最可能机制似乎是氢脆辅助的氢辅助阳极溶解。破坏后，通过扫描电子显微镜观察断裂表面，并通过X射线能量色散光谱获得化学分析。在空气中测试的样品表现出韧性的破坏，而在腐蚀性溶液中，样品表现出脆性断裂。

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