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首页> 外文期刊>ISIJ international >Effects of Cu Addition on Hydrogen Absorption and Diffusion Properties of 1470 MPa Grade Thin-walled Steel Tube under Atmospheric Corrosion
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Effects of Cu Addition on Hydrogen Absorption and Diffusion Properties of 1470 MPa Grade Thin-walled Steel Tube under Atmospheric Corrosion

机译：铜对大气腐蚀下1470 MPa级薄壁钢管吸氢扩散性能的影响

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摘要

Hydrogen embrittlement is caused by the introduction of hydrogen into steel and is critical for high strength steels. To clarify the effects of Cu addition on hydrogen absorption and diffusion properties of steel under atmospheric condition, corrosion test was conducted on a 1470 MPa grade thin-walled low carbon martensite steel tube. To this end, a martensite steel tube bearing 0.18% C, 0.4% Si, 1.5% Mn, 0.15% Cu, 0.01% Nb was prepared and compared with Cu free steel tube. As a result of EPMA mapping for the rust layer, Cu accumulated discretely on the rust/steel interface, especially in the bottom of pits of 0.15% Cu bearing steel tubes after the atmospheric corrosion test over 12 years. According to x-ray absorption near-edge structure (XANES) spectra, the valence of Cu in the rust layer was mainly +2 as Cu-(O, OH, SO_(4)). The average and maximum diffusible hydrogen content level of 0.15% Cu bearing steel was lower than that of Cu free steel after the atmospheric corrosion test. The quantity of non-diffusible hydrogen was much higher than that of diffusible hydrogen. According to diffusion calculation results, hydrogen diffusion was so rapid that the long-term corrosion hysteresis seemed to have little influence on the diffusible hydrogen content. Furthermore, the short-term corrosion hysteresis may be the main determinant of diffusible hydrogen concentration. Having regard to the fact that the valance of Cu could also be 0 as reported by Shimizu et al. , an inhibition mechanism from accumulated Cu on hydrogen-induced cracking was proposed. Eluted Cu~(y+) ions in the rust layer may precipitate as metallic Cu at the microscopic cathode during the corrosion test. As a result, the microscopic cathode becomes inactivated as an electrochemical reaction site for hydrogen. The Cu alternates between precipitates and Cu ions depending on the relative humidity, and the condensation and pH of the water in the rust layer.
机译：氢脆是由氢引入钢引起的，这对于高强度钢至关重要。为了弄清楚添加铜对大气条件下钢的氢吸收和扩散性能的影响，对1470 MPa级薄壁低碳马氏体钢管进行了腐蚀试验。为此，制备了承载0.18％C，0.4％Si，1.5％Mn，0.15％Cu，0.01％Nb的马氏体钢管，并将其与无铜钢管进行比较。由于对锈层进行了EPMA映射，经过12年的大气腐蚀试验，Cu离散地聚集在锈/钢界面上，特别是在含0.15％Cu的钢管的凹坑底部。根据X射线吸收近边缘结构（XANES）光谱，锈层中的Cu的价态主要为+2，为Cu-（O，OH，SO_（4））。经过大气腐蚀试验后，含铜量为0.15％的钢的平均和最大扩散氢含量水平低于不含铜的钢。不可扩散氢的量远高于不可扩散氢的量。根据扩散计算结果，氢扩散非常快，以至于长期腐蚀滞后似乎对扩散氢含量几乎没有影响。此外，短期腐蚀滞后可能是扩散氢浓度的主要决定因素。考虑到清水等人报道的Cu的价数也可以为0这一事实。提出了Cu的累积对氢致裂纹的抑制机理。在腐蚀测试过程中，锈层中洗脱的Cu〜（y +）离子可能会作为金属Cu沉淀在微观阴极上。结果，微观阴极成为氢的电化学反应位点而失活。根据相对湿度以及锈层中水的冷凝和pH值，Cu在沉淀物和Cu离子之间交替变化。

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