Protective Coatings for Prevention of Stress Corrosion Cracking (SCC) in the Steel Pipes

Stress Corrosion Cracking (SCC) in pipelines is a type of environmentally assisted cracking (EAC). SCC in pipelines is further characterized as “high pH SCC” or “near neutral pH SCC”. Coating type and condition have a profound effect on SCC. SCC will not occur beneath an intact coating that prevents contact of groundwater with the pipe surface. This paper reviews various types of coatings, for susceptibility to SCC occurrence. It is indicted that, FBE, liquid epoxies, and urethane coatings meet all three requirements of an effective coating against SCC and tape coatings and bituminous coatings have been shown to be more susceptible to SCC. Regardless of the coating selected, the line pipe surface should be prepared to a white (NACE No.1/SSPC-SP 5) or near white (NACE No. 2/SSPC-SP 10) finish to remove mill scale and to impart sufficient residual compressive stresses to retard SCC initiation.

کلیدواژه ها:

Stress Corrosion Cracking (SCC) ، Steel pipes ، Coating