Authors: Natividad, C.; Salazar, M.; Garcia, R.; Gonzalez-Rodriguez, J. G.; Pérez, R.

Source: Corrosion Engineering, Science and Technology, Volume 41, Number 1, March 2006 , pp. 91-95(5)

Publisher: Maney Publishing

Abstract:

The aim of the present study was to evaluate the corrosion resistance of weldments produced by the Indirect Electric Arc technique. The material studied was API grade X-65 steel, which was corroded in NACE solution saturated with H₂S. Three different temperatures were employed, room temperature (25°C), 37°C and 50°C. The test methods used included potentiodynamic polarisation curves, hydrogen permeation measurements and slow strain rate tests. The anodic corrosion current density and sulphide stress cracking susceptibility of the weldments were found to be unaffected by temperature over the range 25–50°C. However, values of the steady-state hydrogen permeation current, hydrogen permeation rate, effective diffusion coefficient, and the concentration of hydrogen atoms at the entrance side all increased with temperature. The cracking of the X-65 weldments is explained in terms of a hydrogen embrittlement mechanism.

Keywords: INDIRECT ELECTRIC ARC; SULPHIDE STRESS CRACKING; HYDROGEN EMBRITTLEMENT

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174327806X93974

Publication date: 2006-03-01

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