高浓度硫化氢的现场腐蚀管控措施研究

STUDY ON THE ON-SITE CORROSION CON-TROL MEASURES FOR HIGH CONCENTRA-TION HYDROGEN SULFIDE

C100钢广泛应用于含H_(2)S环境中,一旦有O_(2)进入到含H2S的腐蚀环境中时,会引起设备设施的腐蚀失效。基于电化学实验和腐蚀图像表征方法研究了H_(2)S环境中O_(2)分压对C100钢的腐蚀行为。结果表明,在不同H_(2)S和O_(2)分压比条件下,腐蚀过程受阴极过程控制,由氧扩散过程向活化过程转变;随着O_(2)分压的增大,腐蚀电位负向偏移,腐蚀电流密度迅速增大,同时腐蚀形貌由全面腐蚀状态向点蚀状态转变。

Steel C100 is widely used in H_(2)S-containing environment.But once O_(2) enters the H_(2)S-containing corrosive environment,it will cause corrosion failure of equipment and facilities.In this paper,the corrosion behavior of steel C100 under O_(2) partial pressure in H_(2)S environment was studied based on electrochemical experiments and corrosion image characterization method.The results show that under different partial pressure ratios of H_(2)S and O_(2),the corrosion process is controlled by the cathodic process,which changes from oxygen diffusion process to activation process.With the increase of O_(2) partial pressure,the corrosion potential shifts negatively;he corrosion current density increases rapidly,and meanwhile the corrosion morphology changes from general corrosion state to pitting state.