温度和氯离子浓度对30CrMnSiNiA腐蚀速率的影响研究

目的研究温度和氯离子浓度对金属腐蚀速率的影响。方法通过失重法研究对比30CrMnSiNiA结构钢在不同氯离子浓度和温度下的腐蚀速率。结果 30CrMnSiNiA钢的腐蚀速率都经历了一个增大-减小-趋于稳定的过程,说明腐蚀机理并未发生改变。在温度较低和氯离子浓度较低的条件下,升高温度和氯离子浓度将会提高腐蚀速率;当温度和氯离子浓度很高时,继续升高温度和氯离子浓度将会降低溶液中溶解氧的含量,使腐蚀速率降低,溶解氧的极限扩展速率将会成为限制腐蚀速率的关键因素。结论不同温度和氯离子浓度下金属腐蚀规律相同,温度和氯离子浓度在一定范围内促进了金属的腐蚀速率。当超过转化点后,提高温度和氯离子浓度会降低腐蚀速率。

Effects of Temperature and Chloride Ion Concentration on Corrosion Rate of 30CrMnSiNiA

Objective To study effects of temperature and chloride ion concentration on the corrosion rate of metal. Methods The corrosion rate of 30CrMnSiNiA steel structure at different chloride ion concentration and temperature was researched and compared with the weight loss method. Results The corrosion rate of steel 30CrMnSiNiA experienced an increase--decrease-- stabilizing process, which mean that the corrosion mechanism was not changed. At low temperature and low chlorine, elevated temperature and chlorine concentration would increase the corrosion rate; at high temperature and chlorine ion concentration, continuous raising the temperature and chlorine ion concentration would reduce the content of dissolved oxygen in solution, and thus decrease the corrosion rate. The limit extension rate of dissolved oxygen would become the key factor limiting the corrosion rate. Conclusion Rules for corrosion behaviors of the metal at different temperature and chlorine are the same. The temperature and chloride ion concentration promote the corrosion rate of metal within a certain scope. If the inversion point is exceeded, improving the temperature and chloride ion concentration can reduce the corrosion rate.