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通过盐雾腐蚀实验并结合SEM和XRD分析,研究了稀土元素对锻造态ZK60镁合金腐蚀行为的影响。结果表明,ZK60合金耐蚀性较差,而在ZK60中添Gd、Y后的合金,其耐蚀性明显提高。腐蚀时间相同时,两种合金的微观腐蚀形貌不相同,ZK60合金腐蚀坑的形成时间较早(14 d),而添加Gd、Y后的ZK60合金腐蚀坑的形成时间较晚(21 d),添加Gd、Y后ZK60合金的腐蚀产物相对致密。两种镁合金的腐蚀产物均为Mg(OH)2,Mg(OH)2腐蚀产物膜极易发生开裂,形成网块状的腐蚀产物膜。腐蚀产物膜的进一步生长、开裂和脱落,加速了材料的腐蚀流失。
The effects of rare earth elements on corrosion behavior of forged ZK60 magnesium alloy were studied by salt spray corrosion test combined with SEM and XRD analysis. The results show that the corrosion resistance of ZK60 alloy is poor. However, the addition of Gd and Y in ZK60 significantly improves the corrosion resistance. When the corrosion time is the same, the corrosion morphology of the two alloys is different, the formation time of the corrosion pits of ZK60 alloy is earlier (14 d), and that of the ZK60 alloy pits after the addition of Gd and Y is later (21 d) , After adding Gd, Y ZK60 alloy corrosion products are relatively dense. The corrosion products of the two kinds of magnesium alloys are all Mg (OH) 2, and the corrosion products of Mg (OH) 2 are easily cracked to form the lump corrosion products. Further growth of corrosion products film, cracking and shedding, accelerated the loss of corrosion of the material.