Sociedad Española de Integridad Estructural
Grupo Español de Fractura

Sociedad Española de Integridad Estructural
Grupo Español de Fractura

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SOME THOUGHTS ON THE COMPETITION BETWEEN CORROSION AND CRACKING IN HYDROGEN SULFIDE ENVIRONMENT

G.GABETTA        

Anales de la Mecánica de la Fractura, nº 32 . 2015 . Pág. 71 -76
Ver (.pdf): Anales32-010

Resumen: Sulfide Stress Cracking (SSC) is a form of Stress Corrosion Cracking (SCC) where the presence of H2S increases the probability of crack formation in steels exposed to wet environments. The phenomenon is explained as a consequence of Hydrogen Embrittlement (HE), since hydrogen atoms originated by electrochemical corrosion processes are adsorbed in the metal, increasing cracking susceptibility. In this mechanism, H2S acts mainly as a poison for the recombination of hydrogen atoms. The above mechanism requires to be active the presence of corrosion, i.e. the presence of water. However, it is observed in stainless steel, where cracks are fine and the surface remains clean and brilliant, and in Carbon Steels (CS), where the surface appears heavily corroded and covered by a sulphide layer. In CS, cracks are often generated at the bottom of corrosion pits and need time to develop. This paper tries to stimulate the discussion on the subject of interaction between general corrosion and cracking. Results of some tests in Ultra High pressure of H2S will be also presented to support the necessity of a better understanding of definitions, process and mechanisms of SSC.

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