摘要
采用电化学方法研究了Gd含量对ZK60系镁合金在3.5%NaCl溶液中的腐蚀行为,并用金相显微镜、SEM观察了铸态显微组织及腐蚀形貌,对腐蚀产物进行了XRD分析。结果表明:稀土元素Gd可以细化合金晶粒,减少粗大共晶相MgZn的含量;在3.5%NaCl溶液中,腐蚀产物主要为Mg(OH)2;通过极化曲线测试,ZK60+1.6%Gd合金耐蚀性最好;在Cl-作用下,腐蚀以点蚀为主,同时会形成以第二相MgZn和Mg5Gd为阴极,α-Mg为阳极的电偶腐蚀。
The effects of gadolinium on the corrosion behavior of ZK60 magnesium alloy have been studied by means of electrochemistry in the solution of NaCl in this paper. The microstructure and the corrosion surface are observed using SEM and XRD. The result shows that the gadolinium can obviously refine the grain of ZK60 magnesium alloy and decrease the amount of MgZn phase. The corrosion products are mainly Mg（OH）2 in the solution of NaCl. By polarisation curve test, it is found that the ZK60＋ 1.6%Gd has the best corrosion resistance The Corrosion is mainly a pitting corrosion, meanwhile, a galvanic corrosion can be also formed for the α-Mg as an anode and the second phase MgZn and Mg5Gd as a cathode.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第6期1056-1059,共4页
Rare Metal Materials and Engineering
关键词
镁合金
钆
耐蚀性
magnesium alloy
gadolinium
corrosion resistance
