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对扩散型热浸镀铝-镧钢的抗H2S腐蚀性能及机理进行了研究。通过SEM、TEM、XRD等对热浸镀铝-镧扩散层的组织结构进行观察和分析。结果表明,稀土镧可提高热浸镀铝钢的抗腐蚀性能。热浸镀铝-镧钢的扩散层中存在非晶态相,且稀土镧的添加可使扩散层中的非晶含量增加。在靠近扩散层的最外层表面有一约30μm厚的过渡层,该层为非晶态占优的非晶合金与纳米晶粒的混合区,且随着深度增加,非晶逐渐减少。分析认为,扩散层中存在大量的非晶态合金是稀土镧提高扩散型热浸镀铝钢抗腐蚀性能的主要原因。
The anti-H2S corrosion performance and mechanism of diffusion-type hot-dip aluminized-lanthanum steel were studied. The microstructures of the hot-dip aluminized-lanthanum diffusion layers were observed and analyzed by SEM, TEM and XRD. The results show that rare earth lanthanum can improve the corrosion resistance of hot dip aluminized steel. Amorphous phase exists in the diffusion layer of the hot-dip aluminized-lanthanum steel, and the addition of rare earth lanthanum can increase the amorphous content in the diffusion layer. Near the outermost surface of the diffusion layer, there is a transition layer of about 30 μm in thickness, which is a mixture of amorphous and amorphous alloy dominated by amorphous state, and the amorphous phase gradually decreases as the depth increases. The analysis shows that a large amount of amorphous alloy in diffusion layer is the main reason that rare earth lanthanum improves the corrosion resistance of diffusion-type hot-dip aluminized steel.