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利用激光热辐射对X70管线钢表面进行渗铝处理,通过SEM观察了渗铝层表面和界面形貌,并对其结合界面的化学元素进行了EDS线能谱分析。对盐雾腐蚀后界面化学元素进行了EDS面能谱分析,用XRD分析了盐雾腐蚀前后渗铝层表面的物相,研究了渗铝层对X70管线钢抗盐雾腐蚀性能的影响。结果表明,激光热辐射渗铝处理后X70管线钢表层为氧化铝层,化学元素在表面和界面分布均匀,无富集现象,在结合界面处相互渗透,形成冶金结合形式;盐雾腐蚀后原始试样表面点蚀严重,形成全面腐蚀;渗铝处理后试样表面生成致密的Al2O3保护膜,阻止了腐蚀性介质Cl-离子和基体活性Fe的接触,提高了X70管线钢抗盐雾腐蚀能力。
The surface of X70 pipeline steel was aluminized by laser heat radiation. The surface and interfacial morphology of aluminized layer were observed by SEM. The chemical elements of the interface of X70 were analyzed by EDS. The EDS surface energy spectra of the chemical elements after salt spray corrosion were analyzed. The surface phases of aluminized coatings before and after salt spray corrosion were analyzed by XRD. The effects of aluminized coatings on the salt spray corrosion resistance of X70 pipeline steel were also studied. The results show that the surface layer of X70 pipeline steel is aluminum oxide layer after laser heat radiating aluminum treatment. The chemical elements distribute evenly on the surface and interface without enrichment, and penetrate each other at the bonding interface to form the metallurgical bonding form. After salt spray corrosion, Pitting serious corrosion on the surface of the sample, the formation of a comprehensive corrosion; aluminized surface of the sample generated dense Al2O3 protective film to prevent the corrosive medium Cl- ions and the matrix of active Fe contact, improve the X70 pipeline corrosion resistance to salt spray .