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一、引言铸造型高铬镍不锈钢是湿法磷酸生产的常用材料,其腐蚀行为与介质的温度及氯离子含量有密切的关系。随湿法磷酸生产工艺流程的改进和生产效率的提高,萃取槽的反应温度逐步增高。二水法生产工艺的介质温度为75～80℃;而半水法生产工艺的介质温度为100℃左右。由于磷矿来源的不同,反应介质中氯离子的含量也有很大的差异。因此,
I. Introduction Foundry high chromium nickel stainless steel is a commonly used material for the production of wet-process phosphoric acid. Its corrosion behavior is closely related to the temperature of the medium and the chloride ion content. With the improvement of wet-process phosphoric acid production process and production efficiency, the reaction temperature of the extraction tank is gradually increased. Two water production process medium temperature is 75 ~ 80 ℃; semi-water production process medium temperature is about 100 ℃. Due to the different sources of phosphate rock, the chloride content in the reaction medium is also very different. therefore,