Zn-13%Ni 電気合金めつき鋼板の腐食生成物の各種表面分析機器による解析(表面処理分析小特集)

概要

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Corrosion layers on electrodeposited Zn-Ni(13wt%) alloys are analyzed using Auger Electron Spectroscopy (AES), Scanning Auger Spectrometer (SAM), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscope (SEM), and X-ray Diffraction (XRD). It was found that surfaces of the alloys corroded by SST (salt spray test) were covered with zinc oxide and zinc hydroxide, and their inner layers consisted of γ phase alloy and ZnCl_2・4Zn(OH)_2. On the other hand, the surface layer of the alloys immersed in 5% NaCl solution consisted of ZnO and ZnCl_2・4Zn(OH)_2. It is pointed out that the enrichment of Ni between the surface and the inner layers does not occur. Chlorine does not exist in the surface layer of the alloys corroded by SST but does in the inner layer. As for the samples immersed in 5% NaCl solution, it is found in the surface layer as well as in the inner layer. It is emphasized that the corrosion mechanism is completely different between SST and immersion in 5% NaCl solution. Chlorine in the inner layer of the alloys corroded by SST is homogeneously distributed. From above results, the mechanism of corrosion by SST for the alloy is discussed.
社団法人日本鉄鋼協会の論文
1986-09-01