ChemInform Abstract: The Influence of Temperature and the Role of Chromium in the Passive Layer in Relation to Pitting Corrosion of 316 Stainless Steel in NaCl Solution.

1986 ◽  
Vol 17 (51) ◽  
Author(s):  
C. PALLOTTA ◽  
N. DE CRISTOFANO ◽  
R. C. SALVAREZZA ◽  
A. J. ARVIA
Keyword(s):  
Stainless Steel ◽  
Pitting Corrosion ◽  
Passive Layer ◽  
Nacl Solution ◽  
Influence Of Temperature ◽  
316 Stainless Steel

Inspection and mitigation for pitting corrosion on stainless steel process piping to prevent process safety event and loss production opportunity in Medco E&P

2021 ◽  
Author(s):  
I. Rosyadi
Keyword(s):  
Stainless Steel ◽  
Pitting Corrosion ◽  
Sun Exposure ◽  
Passive Layer ◽  
Process Safety ◽  
Pipe Surface ◽  
Corrosion Propagation ◽  
Process Piping ◽  
Safety Event ◽  
Steel Piping

Stainless steel piping has excellent corrosion resistant properties, both internal or external piping surface. In humid circumstances, sea vapor containing chlorine will be trapped on the pipe surface, especially pipes below deck with minimum sun exposure (more humid). Chlorine on the external pipe surface will damage the passive layer of stainless steel pipe. Damage speed is faster than recovery of passive layer stainless steel. This condition lead to a lot of localized pitting corrosion spread. The corrosion was detected visually and carried out with dye penetrant inspection to assure pitting condition. Actual dimension of pitting (depth, diameter) cannot be measured due to limitation of the NDE technique. This pitting corrosion can result hydrocarbon leakage as a process safety event that contributes loss of production opportunity. Without modification circumstances, this condition can be stopped immediately by application of a viscos elastic coating to prevent pitting corrosion propagation. Application of viscos elastic coating is simpler and faster when compared to conventional coating. Viscos elastic coating will protect stainless steel piping surface against oxygen and chloride in humid circumstances so that stainless steel can recover passive layer and stop pitting corrosion.

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