Abstract

FORERO BALLESTEROS, Adriana; BOTT, Ivani de S.  and  CUNHA PONCIANO, José Antônio. Evaluation of the susceptibility to sulphide stress corrosion cracking and hydrogen embrittlement of API 5L X80 girth welds steel manufactured in Brazil. Rev. ion [online]. 2012, vol.25, n.spe, pp.7-15. ISSN 0120-100X.

This study evaluates the susceptibility to sulphide stress corrosion cracking (SSCC) and hydrogen embrittlement (HE) of API 5L-X80 girth welds steel produced in Brazil. Tensile and low strain rate tests (SSRT) and hydrogen permeation tests were performed at room temperature in solutions of sodium thiosulfate, to simulate different acidic environments. The susceptibility to HE and potentially SSCC is manifested by the reduction in ductility in the SSRT tests and increased the values of hydrogen permeation current for almost all welds tested. Increased susceptibility was observed in more acidic solutions (pH = 3.4), while for the test solutions less acidic (pH = 4.4) was observed little loss of ductility and hydrogen permeation current was maintained at values close to zero, indicating little or no penetration of hydrogen through the metal for test times used. This behavior was attributed to the anodic dissolution of Fe with hydrogen embrittlement. It was observed that the pH of the solution has a greater influence than the concentration of H₂S in the susceptibility to SSCC and HE.

Keywords : susceptibility; hydrogen; embrittlement; stress corrosion cracking.

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