采用失重法和极化曲线法对锌在三氯乙酸(TCA)中的腐蚀行为进行实验测定,探讨了TCA的浓度、反应温度对锌腐蚀速率的影响,导出了相应的动力学方程,求得反应的动力学参数和热力学参数,测算出锌的自腐蚀电位和腐蚀电流密度.结果表明:锌在TCA中为匀速腐蚀,受活化控制:腐蚀温度和速率的关系符合Arrhenius公式,腐蚀速率同TCA浓度关系遵循Mathur经验式:锌在三氯乙酸中的腐蚀为放热过程,其腐蚀倾向和程度可以同无机强酸相比:由极化曲线分析,阴极反应的活化能大于阳极反应的活化能,腐蚀为阴极控制.

The weight-loss method,polarization curve method and thermodynamic analysis were used to investigate the corrosion behaviors of metallic zinc in trichloroacetic acid (TCA ).The effects of the concentration of TCA and reaction temperature on the corrosion rate of zinc were examined .The corrosion expression were formulated.The kinetic and thermodynamic parameters were calculated.The potential and corrosion current density of zinc were derived.The results indicated that corrosion of zinc had an even rate and was activation-controled in the studied concentration range.The relationship between corrosion temperature and rate followed Arrhenius formula,while the relationship between TCA concentration and corrosion rate followed Mathur empirical formula.The corrosion tendency and extent are comparable with those in strong inorganic acid.The corrosion is an exothermic process.Activation energy of cathodic reaction is more than that of anodic reaction from polarization curve measurements.The corrosion process is controlled by cathodic reaction.