a 新日鐵住金㈱ 鉄鋼研究所 (〒 660-0891 兵庫県尼崎市扶桑町 1-8) b 新日鐵住金㈱ 先端技術研究所 (〒 660-0891 兵庫県尼崎市扶桑町 1-8) c 岡山大学 大学院自然科学研究科 (〒 700-8530 岡山県岡山市北区津島中 3-1-1)Ni-W alloy plating has been considered for application to various industrial fields as a substitute for hard Cr plating. However, by plating conditions, the plating crack on Ni-W alloy film might occur and cause difficulties in industrial use. In this study, we elucidated the plating crack behavior of Ni-W alloy films with various W contents. We also investigated the influence of the internal stress of Ni-W alloy film on the plating cracks. Results show that the number of the plating cracks changed by W content in the range of 27.3-51 wt%W. At approximately 40 wt%W, plating cracks did not occur. Moreover, the change of the internal stress of Ni-W alloy film in the range of 30-46 wt%W showed a convex-downward curve against the W content, which indicated the least internal stress in approximately 40 wt%W. Furthermore, the influence of the misfit between the Ni-W alloy film and that substrate was small, which suggests that the internal stress of the film itself changed. Therefore, the internal stress was regarded as a direct factor affecting the plating crack. Furthermore, from results of X-ray diffraction patterns of Ni-W alloy films with various W contents, the change of the internal stress was inferred to have resulted from the change of the crystalline state.
Synopsis :We have developed a new mathematical model for galvanic corrosion with ions movement, reactions and electroneutrality. In this model, ion density distribution is corrected by solving Poisson's equation to satisfy electroneutrality. Major ion species and reactions are considered in NaCl solution, MgCl 2 solution and artificial sea water on a Fe/Zn galvanic couple. Distribution of corrosion products in NaCl solution and MgCl 2 solution obtained by numerical analysis agreed well with measured by FTIR method qualitatively.Corrosion progresses at shear cut edge of galvanic steel sheet in NaCl solution, MgCl 2 solution and artificial sea water were simulated and discussed. In addition, galvanic corrosion under a paint film near the shear cut edge was computed. The numerical analysis result indicated that concentration of Cl Ϫ under the paint film was increased by more than factor of 10.
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