摘要
发展适用于镁合金的环保型缓蚀剂对于有效抑制镁合金腐蚀、拓展其应用具有重要意义。苯甲酸钠(SB)作为缓蚀剂对镁合金的作用过去报道较少。为此,采用电化学阻抗谱(EIS)、极化曲线、扫描电子显微镜(SEM)等方法研究了苯甲酸钠对AZ31镁合金在3.5%NaCl腐蚀介质中的缓蚀作用。结果表明:SB是一种阳极型缓蚀剂,通过增大阳极极化有效抑制了AZ31镁合金的腐蚀;缓蚀率随SB浓度的增大而增加,可达87%以上;SB的缓蚀作用主要由在金属表面的吸附引起,在AZ31镁合金表面的吸附符合Temkin吸附模型。
Itis imperative to develop environmentally-friendly inhibitors formagnesium alloys in order to effectively control their corrosion andbroaden their application. Thus electrochemical impedance spec-tra and polarization curves were recorded, and scanning electronmicroscopic observation was conducted to study the corrosion inhi-bition of AZ31 Mg alloy in 3. 5% NaCl corrosive medium by sodi-um benzoate ( SB ) . Results show that SB is an anodic type inhib-itor and mainly inhibits the anodic dissolution reaction of AZ31magnesium alloy. The inhibition efficiency increased with in-creasing concentration of SB, and the highest inhibition efficiencywas more than 87 %. In one word, the inhibition action of SB forthe carbon steel is closely related to its adsorption on the surfaceof AZ31 Mg alloy, and such an adsorption obeys Temkin iso-therm.
出处
《材料保护》
CAS
CSCD
北大核心
2009年第11期24-26,共3页
Materials Protection
基金
国家杰出青年科学基金(50725413)
教育部留学回国人员科研启动基金(教外司留[2007]1108-6)
重庆市科委自然科学基金(CSTC
2008BB4174)项目
关键词
AZ31镁合金
缓蚀剂
苯甲酸钠
腐蚀
AZ31 magnesium alloy
inhibitor
sodium benzoate
inhibition action
