Influence of Rare Earth on Corrosion Resistance Performance of Weathering Steel

The performance of rust layer of 10PCuRE、10PCu weathering steels is studied by XRD, EPMA and SEM. The kind、forming process and protection mechanism of the corrosion products of 10PCuRE are obtained. Through the contrastive study of rust layer of rare earth weathering steel and weathering steel without rare earth,it is obtained the protective rust layer on 10CuPRE is divided into two layers including of outer rust layer and uniform compact inner rust layer. The 80% constituent phase of inner rust layer is steady α-FeOOH. The results indicate rare earth can promote alloying element Cu to enrich in the inner rust layer of 10PCuRE, the protective inner rust layer is easy to creating. So corrosion resistance of steel is improved.