X65管线钢抗H_2S腐蚀的试验研究

Experimental Study on Resistance of Pipeline Steel X65 to H_2S Corrosion

研究了不同显微组织管线钢抗H2S腐蚀的行为·结果表明,酒钢生产的X65管线钢,当显微组织是以针状铁素体为主的混合型组织时,管线钢具有优良的抗H2S腐蚀性能·经硫化氢腐蚀试验后,除出现程度不等的氢鼓泡外,试样断面上基本没有产生裂纹·氢鼓泡是由于钢中夹杂物处吸收由腐蚀而产生的氢所引起的·当钢表面上因腐蚀而释放出原子态氢后,由于硫化氢的催化作用,促进原子氢向钢中扩散,并在夹杂物与基体的界面上聚集形成分子氢·随着过程的进行,产生很高的压力,从而形成鼓泡·

The resistance of pipeline steels to H_2S corrosion was investigated experimentally with different microstructures involved. The results showed that the pipeline steel X65 supplied by Jiuquan Steel Works has a excellent resistance to H_2S corrosion when its microstructure is mainly of acicular ferrites. Few inner cracks were observed on the sections of specimens that were subjected to H_2S corrosion experiments besides some hydrogen bubbles of which the hydrogen arising from corrosion was absorbed at the inclusions in the steel. It implies that when hydrogen atoms are released from the corroded surface of steel they diffuse quickly into the steel through H_2S catalysis and agglomerate at the boundaries between inclusions and matrix to form molecular hydrogen. With the process going on, a high pressure is generated finally to form hydrogen bubbles.