摘要
应力腐蚀开裂是含H2S/CO2天然气输送管线腐蚀破坏的主要形式,探究其开裂机理有利于实施有效的防护,目前相关研究尚不够深入。采用扫描电子显微镜(SEM)和X射线衍射(XRD)等表面分析技术对U形环X52钢试样在H2S/CO2介质中的应力腐蚀开裂(SCC)行为进行了研究,并分析探讨了其发生SCC的机理。结果表明:X52钢的脆性断裂是由于在腐蚀环境中吸收了H原子,H原子扩散并在高应力部位聚集而引起的,在H2S存在且腐蚀产物膜被破坏的情况下发生脆断的可能性会大幅提升。
The stress corrosion cracking (SCC) behavior of U-ring-like X52 steel specimens in the corrosive medium containing H2S/CO2 was investigated based on scanning electron microscopy and X-ray diffraction, and the SCC mechanism of the steel was discussed. Results show that the hrittle fracture of X52 steel is attributed to the absorption of H atoms in corrosive environment and followup diffusion and enrichment at the location with large stress. Besides, the possibility of brittle fracture was greatly increased when H2 S was present in the environment and the protective layer composed of corroded products was broken.
出处
《材料保护》
CAS
CSCD
北大核心
2011年第8期32-33,40,共3页
Materials Protection
