Cl~-在不锈钢管道内腐蚀的安全性研究

通过实验室模拟的方法对化肥厂设备内部介质进行测定,分析其中主要腐蚀气体成分及浓度,为化工厂生产过程的改进提出依据,以减少腐蚀及提高化工生产的安全性.其结果表明:平均氯离子浓度分别为50.96 mg·L-1(D304-10、45.40 mg·L-1(D304-2)、56.72 mg·L-1(D305-1)和54.95 mg·L-1(D305-2),均超过了不锈钢不发生应力腐蚀开裂的Cl-极限含量10ppm的5倍、4.5倍、5.6倍和5.4倍.所以,致使化肥厂设备开裂的原因是Cl-在管道内局部富集发生点蚀,进而引发材料的应力腐蚀开裂.

Study on the Safety of the Corrosion of Cl-in Stainless Cteel Pipe

In order to provide reference for improving the productive process, to reduce corrosion and to increase the safety of chemical production, the internal medium of equipment in fertilizer plant was determined by laboratory simulation experiment, the components of major corrosive gas and the concentrations were analyzed. The results showed that the average concentrations of chloride ions were 50.96 mg· L^-1 （ D304-10 ） , 5.40 mg · L^-1 （ D304-2 ）, 56.72 mg· L^-1 （ D305-1 ） and 54. 95 mg· L^-1 （ D305-2 ）, respectively. The concentrations were all above the limit concentration （10 ppm） which can not cause stress corrosion cracking.