一、相关说明石油化工装置因耐蚀要求普遍采用奥氏体不锈钢材料,但焊接会破坏材料表面的保护层,致使材料的耐蚀性锐降。为保证其耐蚀性,在焊接结束后需对焊缝表面和热影响区进行酸洗钝化处理,使其形成一层致密的Cr_2O_3氧化膜,从而达到耐蚀要求,延长装置的服役寿命。 First, the relevant instructions Petrochemical installations due to corrosion resistance commonly used austenitic stainless steel, but the welding will destroy the protective layer of the material surface, resulting in sharp decline in the corrosion resistance of the material. In order to ensure its corrosion resistance, the weld surface and heat affected zone need to be pickled and passivated to form a dense Cr 2 O 3 oxide film after welding to achieve the corrosion resistance requirements and prolong the service life of the device.