The corrosion behaviors of Mg-7Gd-5Y-1Nd-0.5Zr alloy under(NH4)_(2)SO_(4),NaCl and Ca(NO_(3))_(2)salts spray condition  

作　　者：Quantong Jiang Kui Zhang Xinggang Li Yongjun Li Minglong Ma Guoliang Shi Jiawei Yuan 

机构地区：[1]State Key Lab for Non-ferrous Metals and Process,Beijing General Research Institute for Non-ferrous Metals,Beijing 100088,China

出　　处：《Journal of Magnesium and Alloys》2013年第3期230-234,共5页镁合金学报（英文）

基　　金：Foundation item:National Natural Science Foundation of China(No.51204020);National Basic Research Program of China(No.2013CB632202,No.2013CB632205).

摘　　要：The corrosion behaviors of Mg–7Gd–5Y–1Nd–0.5Zr alloys after T5 treatment under(NH4)_(2)SO_(4),NaCl and Ca(NO_(3))_(2)salt spray condition were investigated by weight loss rates,residual mechanical properties,scanning electron microscope(SEM),X-ray Diffraction(XRD)and potentiodynamic polarization tests.The corrosion degree of Mg–7Gd–5Y–1Nd–0.5Zr alloys in Ca(NO_(3))_(2)salt spray was very shallow by corrosion morphology and the corrosion route was extended along the surface in texture-like shape,while the alloy in NaCl and(NH4)_(2)SO_(4)salt spray were major local corrosion and there were serious corrosion pits on the surface.The weight loss rates in(NH4)_(2)SO_(4),NaCl and Ca(NO_(3))_(2)salt spray was respectively 0.4147,0.1618 and 0.0725 mg/(cm2 d−1).The results of residual mechanical properties indicated that the corrosion order in salts spray of Mg–7Gd–5Y–1Nd–0.5Zr alloys is NH4SO4>NaCl>Ca(NO_(3))_(2),which was consistent with the results of potentiodynamic polarization tests.The type of the salts will play a vital role in the initiation of the corrosion of EW75 alloy when they are used in the atmosphere environments.Inorganic salts with the smaller PH value after dissolution will have a stronger impact on the corrosion of EW75 magnesium alloys.

关 键 词：EW75 magnesium alloy Corrosion behaviors Salt spray PH value 

分 类 号：TG1[金属学及工艺—金属学]