温度和包装内缓蚀气压对金属气相防锈的影响

Effect of Temperature and Corrosion Inhibition Air Pressure in Package on Metal Vapor Phase Rust Prevention

目的通过电化学方法探究气相防锈包装过程中温度和包装内缓蚀气压对气相防锈效果的影响,为实际工况中获得较长的气相防锈有效寿命期提供数据参考。方法以10^(#)钢和铸铁为金属试样作为工作电极,通过交流阻抗谱和动极化曲线对不同温度和不同缓蚀气压下试样缓蚀过程进行研究,并分析其电化学参数变化规律,对缓蚀效果进行评价和比较。结果交流阻抗谱结果表明,温度升高和缓蚀气压下降时,金属试样表面阻抗值减小,且在高温低频区出现Warburg阻抗,腐蚀机理发生改变。动极化曲线结果表明,随着温度升高和缓蚀气压下降,金属试样的腐蚀电流减小,腐蚀电压负移。结论温度升高及包装内的缓蚀气压下降均会造成金属气相防锈效果下降,且升温后缓蚀剂对缓蚀气压的变化更敏感,为延长气相防锈包装的有效寿命期应关注高温工况,并确保气相防锈包装内缓蚀气压稳定。

The work aims to study the effect of temperature and corrosion inhibition pressure in the package on the vapor phase rust prevention effect by electrochemical method,to provide data reference for obtaining a long effective life of vapor phase rust prevention in actual working conditions.10^(#)steel and cast iron were used as working electrodes.The corrosion inhibition process of the specimens at different temperature and pressure was studied through AC impedance spectroscopy and dynamic polarization curves.The change rules of electrochemical parameters were analyzed,and the corrosion inhibition effects were evaluated and compared.The results of AC impedance spectrum showed that the surface impedance of metal specimens decreased with the increase of temperature and the decrease of corrosion inhibition air pressure,and Warburg impedance appeared in the region of high temperature and low frequency,and the corrosion me-chanism changed.The results of dynamic polarization curve showed that the corrosion current decreased and the corrosion voltage decreased with the increase of temperature and the decrease of corrosion inhibition air pressure.It is concluded that both the increase of temperature and the decrease of corrosion inhibition air pressure in the package would cause decrease of metal vapor phase rust prevention effect,and the corrosion inhibitor is more sensitive to the change of corrosion inhibition air pressure after heating up.To prolong the effective life of the vapor phase corrosion protection package,it is required to pay attention to the high temperature working condition and ensure the stability of corrosion inhibition air pressure in the vapor phase corrosion prevention package.