In Situ Observations For Corrosion Process At Fusion Boundary Of Cr5Mo Dissimilar Steel Welded Joints In H2S Containing Solution
ZOU Yang; PAN Chunxu; FU Qiang; CHEN Chao
Department of Physics; Wuhan University; Wuhan 430072
Cite this article:
ZOU Yang; PAN Chunxu; FU Qiang; CHEN Chao. In Situ Observations For Corrosion Process At Fusion Boundary Of Cr5Mo Dissimilar Steel Welded Joints In H2S Containing Solution. Acta Metall Sin, 2005, 41(4): 421-426 .
Abstract The corrosion behaviours of the welded joints between steels Cr5Mo and
A302 (Cr25Ni13) in the H2S containing solution (NACE TM--01--77
standard) were studied. In situ SEM observations revealed that compared
with other zones the
fusion boundary is the worst region for corrosion resistance due to the
hydrogen induced disbonding, the corrosion resistance of the post--weld
heat--treated joint
is worse than that of the as--welded one and the fusion boundary with a
broad scale has a stronger resistance for the hydrogen induced disbonding
than the narrow one. These variations are related to the inhomogeneous
microstructures, carbon diffusion, hydrogen--enrichment and stress
concentration around the fusion boundary.
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