通过对比商业化的抑制剂颜料铬酸锶和改性多聚磷酸锶铝,研究了新型绿色抑制剂颜料-肉桂酸铈对轨道交通用7XXX铝合金的腐蚀抑制行为和含肉桂酸铈环氧涂层的腐蚀防护行为.浸泡实验的结果表明,肉桂酸铈和铬酸锶对铝合金的腐蚀具有优秀的抑制作用.极化曲线(PDS)的结果表明,改性多聚磷酸锶铝在浸泡初期对铝合金具有较强的腐蚀抑制能力,而这种腐蚀抑制能力在浸泡后期弱于肉桂酸铈和铬酸锶.研究了含有1％(质量分数)以上3种抑制剂颜料环氧漆的腐蚀行为,电化学阻抗谱(EIS)结果表明,含有1％肉桂酸铈的环氧涂层具有优秀的腐蚀防护能力.
A new cerium cinnamate was proposed as a green anticorrosive pigment for protection of 7XXX Al-alloy used in transportation.Taking commercial anticorrosive pigments,i.e.,strontium chromate and modified strontium aluminum polyphosphate as reference,the corrosion inhibition of cerium cinnamate on the alloy and the corrosion protection behavior of the cerium cinnamate containing epoxy coatings were investigated.The results of immersion test indicate that the corrosion inhibition effect of strontium chromate and cerium cinnamate is stronger than that of modified strontium aluminum polyphosphate.The results of polarization tests indicate that although modified strontium aluminum polyphosphate has strong corrosion inhibition effect in the beginning of immersion,however,this effect becomes weaker at the end of immersion as compared with the effect of cerium cinnamate and strontium chromate.The results of electrochemical impedance spectra (EIS) show that the corrosion resistance of epoxy coating with 1％(mass fraction) cerium cinnamate is higher than the epoxy coatings with the other two pigments.
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