摘要
以Ca微合金化的Mg-6Al-1.2Zn系合金为研究对象,利用电化学法、失重法等研究了Ca含量对合金铸态和热处理态试样的组织与耐腐蚀性能的影响。结果表明,不同Ca含量的Mg-6Al-1.2Zn-xCa合金的铸态组织主要由α-Mg固溶体和β-Al12Mg17相组成;随着Ca含量的不同,合金中β-Al12Mg17相的数量与形态存在一定的差异。经过固溶时效处理后合金的腐蚀电位都发生了正向移动,腐蚀电流降低,合金的耐腐蚀性能得到提高,Ca含量为1%的Mg-Al-Zn-Ca合金具有优良的耐腐蚀性能。
Effects of Ca addition on microstructure and corrosion behavior of Mg-Al-Zn alloys at as-cast state and heat treatment state were investigated by the electrochemical method, weight loss method. The results show that the as-cast microstructure of Mg-Al-Zn-Ca alloy with varied Ca addition is composed of primary Mg phase and β-Al12 Mg17. With different Ca addition, there exists difference in amounts and shape of β-Al12 Mg17 phase in the alloy. After solid solution treatment, corrosion potential is shifted to positive, and corrosion current is decreased, which takes the attribution to improvement of corrosion resistance of the alloy prepared. The Mg-Al-Zn alloy with 1% Ca addition exhibits desirable corrosion resistance.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2014年第5期535-538,共4页
Special Casting & Nonferrous Alloys
