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Yan Liu,Shawei Tang,Guangyi Liu,Yue Sun,Jin Hu 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
In this study, a welded Ti-6Al-4V alloy was treated by means of local rapid induction heating in order torelax the residual stress existed in the weldment. The welded samples were heat treated at the differenttemperatures. The stress corrosion cracking behavior and electrochemical characterization of the as-weldedsamples before and after the post weld heat treatment as a function of residual stress were investigated. Electrochemical impedance spectroscopy measurements of the samples under slow strain rate test wereperformed in a LiCl-methanol solution. The results demonstrated that the residual stress in the as-weldedsample was dramatically reduced after the post weld heat treatment, and the residual stress decreased withthe increase in the heat treatment temperature. The stress corrosion cracking susceptibility and electrochemicalactivity of the as-welded sample were significantly reduced after the heat treatment due to therelaxation of the residual stress, which gradually decreased with the decreasing value of the residual stressdistributed in the heat treated samples.
Xinghui Sun,Shawei Tang,Ying Zhou,Ying Mao,Jin Hu,Wen Wang,Jiaping Han 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9
A myristate coating containing Ca and Ce (Ca/Ce coating) was fabricated on the surface of an anodized magnesium alloyby a handy, rapid and facile electrodeposition method. The deposited coatings presented superhydrophobicity and excellentcorrosion properties in 3.5 wt% NaCl solution. The effects of the concentration ratio of Ca2+and Ce3+in the electrolytesolution on the morphology, hydrophobicity and corrosion properties of the Ca/Ce coatings had been studied. The formationmechanism of the Ca/Ce coatings had been discussed in detail. The results indicated that the introduction of Ce ions in theelectrolyte solution could enhance the coatings’ thickness and hydrophobicity compared with the single Ca coating. In orderto provide durable and stable protection for magnesium alloy, an appropriate ratio of Ca2+and Ce3+is requisite for the Ca/Ce coating with rare cracks and high superhydrophobicity.