论文部分内容阅读
本文研究了70Cu－30Ni合金海水暴露不同时间腐蚀产物膜特征和成分变化。研究表明，该合金腐蚀产物膜内存在一个富Ni区，富Ni区随着暴露时间延长变宽且Ni的富集程度增加，富Ni腐蚀产物膜充当阳极，从而保护基体。长期暴露所形成的腐蚀产物膜出现裂纹或沟，这是由于膜下基体在这些位置存在结构或成分的变化使膜的生长速度减慢或者内应力导致膜的破裂。随着外层膜的溶解与脱落，原裂纹或沟成为凸出条纹，凸出条纹中Ni与Cu的浓度比高于条纹之间区域中Ni与Cu的平均浓度比，凸出条纹优先溶解使膜表面趋向平整。膜中碳量随暴露时间延长而增加，因此可以认为碳来源于海水而不是来自加工残碳膜。
In this paper, the film characteristics and composition changes of corrosion products of 70Cu-30Ni alloy seawater exposed at different times were studied. The results show that there is a Ni-rich zone in the corrosion product film, and the Ni-rich zone broadens with the extension of exposure time and the enrichment of Ni increases. The Ni-rich corrosion film acts as an anode to protect the matrix. Long-term exposure of the corrosion products formed by the film cracks or ditch, which is due to sub-matrix in these positions there is a change in the structure or composition of the film slowed down the growth rate or internal stress caused the film rupture. With the dissolution and shedding of the outer film, the original cracks or grooves become protruding stripes, the concentration ratio of Ni and Cu in the protruding stripes is higher than the average concentration ratio of Ni and Cu in the region between the stripes, and the protruding stripes are preferentially dissolved Membrane surface tends to be flat. The amount of carbon in the membrane increases as the exposure time increases, so it can be assumed that the carbon comes from seawater rather than from the processed residual carbon membrane.