丁苯橡胶装置废气风机腐蚀裂纹分析

CORROSION CRACKING ANALYSIS OF EXHAUST FAN IN STYRENE-BUTADIENE RUBBER PLANT

分析了丁苯橡胶装置后处理单元废气风机叶轮发生腐蚀开裂的原因,结果表明:风机叶轮的腐蚀开裂为氯化物应力腐蚀开裂。文章分别从注剂影响、腐蚀介质影响、材质影响三方面进行了分析讨论,认为在废气中的Cl-、叶轮加工制作与焊接产生的形变应力及叶轮材质304奥氏体不锈钢的共同影响下导致叶轮发生氯化物应力腐蚀开裂。并提出了涂料防腐、更换材质、替换分散剂等防护措施,通过对国内同类丁苯橡胶装置分散剂使用情况进行调研,结果表明:通过替换现有分散剂而避免氯化物应力腐蚀的方法是可行的。

This paper analyzes the causes for the corrosion cracking of the exhaust fan impeller in the post-processing unit of styrene-butadiene rubber plant.And the results indicate that the corrosion cracking of the fan impeller belongs to chloride stress corrosion cracking.It analyzes and discusses the cracking from three aspects covering impacts of injection agent,corrosion medium and material.It is considered that the chlorine stress corrosion cracking of the impeller occurred under the combined effects of chlorine ion in the waste gas,deformation stress from impeller machining and welding and the impeller material of 304 austenitic stainless steel.The paper then proposes some protective measures involving anti-corrosion coating,changing material and replacing dispersant.Through research on the using of dispersants in the styrene-butadiene rubber plants similar to domestic ones,the results show that the method of avoiding chloride stress corrosion by means of replacing existing dispersants is feasible.