Sulphide stress cracking behaviour of weldments produced by indirect electric arc welding
Por:
Natividad C., Salazar M., Garcia R., Gonzalez-Rodriguez J.G., Pérez R.
Publicada:
1 ene 2006
Resumen:
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. © 2006 Institute of Materials, Minerals and Mining.
Filiaciones:
Natividad C.:
Facultad de Química, UNAM Circuito Interior, Edificio B, C.P. 04510, Mexico, D.F., Mexico
Salazar M.:
Instituto Mexicano del Petróleo, Programa de Investigación y Desarrollo de Ductos, Eje Central Lazaro Cardenas #152, 07730, Mexico D.F., Mexico
Garcia R.:
Instituto de Investigaciones Metalúrgicas, UMSNH, Morelia, Mich, Mexico
Gonzalez-Rodriguez J.G.:
UAEM-CIICAP, Av. Universidad 1001, Col. Chamilpa, 6225-Cuemavaca, Mor., Mexico
Pérez R.:
Instituto Mexicano del Petróleo, Programa de Investigación y Desarrollo de Ductos, Eje Central Lazaro Cardenas #152, 07730, Mexico D.F., Mexico
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