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09348 Prevention of External Chloride Stress Corrosion Cracking of Austenitic Stainless Steel with a

Picture for 09348 Prevention of External Chloride Stress Corrosion Cracking of Austenitic Stainless Steel with a
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Electrochemical and slow strain rate tests were done to demonstrate the protective ability of a thermal sprayed aluminum coating to prevent chloride stress corrosion cracking of TP304L SS in aqueous chloride solutions. Mitigation methods.

Product Number: 51300-09348-SG
ISBN: 09348 2009 CP
Author: Johan F.M. Van Roij and Jan G. De Jong
Publication Date: 2009
Industry: Coatings and Linings
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$20.00
$20.00

External chloride stress corrosion cracking (ECSCC) of insulated austenitic stainless steels (e.g. TP304 SS and TP316 SS) can occur when water containing chloride is present underneath insulation, external metal skin temperature exceeds approximately 50 °C, and there is no surface protection or when the protective coating (e.g. paint) is damaged. A thermal sprayed aluminum (TSA) coating can provide a robust barrier preventing corrosive water from reaching the stainless steel metal surface, but can also provide cathodic protection, even when the TSA coating is damaged. Electrochemical tests and slow strain rate tests were performed to demonstrate the protective ability of a thermal sprayed aluminum coating to prevent chloride stress corrosion cracking of TP304L SS in aqueous chloride solutions. In order to compare the application of TSA coatings with other methods to mitigate ECSCC, this paper also discusses alternative mitigation methods.

Keywords: corrosion under insulation, CUI, chloride stress corrosion cracking, austenitic stainless steel, TP 304SS, slow strain rate test, thermal spray aluminum, TSA, electrochemical techniques, polarization, cathodic protection, paint coating, Aluminum foil wrapping, Al foil

External chloride stress corrosion cracking (ECSCC) of insulated austenitic stainless steels (e.g. TP304 SS and TP316 SS) can occur when water containing chloride is present underneath insulation, external metal skin temperature exceeds approximately 50 °C, and there is no surface protection or when the protective coating (e.g. paint) is damaged. A thermal sprayed aluminum (TSA) coating can provide a robust barrier preventing corrosive water from reaching the stainless steel metal surface, but can also provide cathodic protection, even when the TSA coating is damaged. Electrochemical tests and slow strain rate tests were performed to demonstrate the protective ability of a thermal sprayed aluminum coating to prevent chloride stress corrosion cracking of TP304L SS in aqueous chloride solutions. In order to compare the application of TSA coatings with other methods to mitigate ECSCC, this paper also discusses alternative mitigation methods.

Keywords: corrosion under insulation, CUI, chloride stress corrosion cracking, austenitic stainless steel, TP 304SS, slow strain rate test, thermal spray aluminum, TSA, electrochemical techniques, polarization, cathodic protection, paint coating, Aluminum foil wrapping, Al foil

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Picture for Chloride Stress Cracking of an Austenitic Stainless Steel Pipe Fitting in a Hydroprocessing Unit
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51317--9518-Chloride Stress Cracking of an Austenitic Stainless Steel Pipe Fitting in a Hydroprocessing Unit

Product Number: 51317--9518-SG
ISBN: 9518 2017 CP
Author: Hayrik Allahverdian
Publication Date: 2017
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Case study: Cracking occurred in a (UNS S32100) type austenitic stainless steel nozzle fitting at a low point in the reactor effluent piping in a Gasoil Hydrotreater unit following start up. Normal preventive measures had been taken.  The failed sample was removed for metallurgical analysis and determination of mechanism(s).
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04022 Experiences on Thermal Spray Aluminum (TSA) Coating for Offshore Structures

Product Number: 51300-04022-SG
ISBN: 04022 2004 CP
Author: Desmond K.K. Tiong, Shell International; Halimah Pit, Sarawak Shell Berhad
Publication Date: 2004
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Since 1982, there has been a move to Thermal Sprayed Aluminum (TSA) coating in the “splash zone” of offshore structures.  Our experience indicates that an experience applicator, good surface preparation and quality of wire combined to achieve required thickness and apply the sealer to seal the entire surface.

 
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03029 STRATEGIES TO PREVENT CORROSION UNDER INSULATION IN PETROCHEMICAL INDUSTRY PIPING

Product Number: 51300-03029-SG
ISBN: 03029 2003 CP
Author: Brian J. Fitzgerald, Peter Lazar III, Robert M Kay, Stefan Winnik
Publication Date: 2003
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Corrosion Under Insulation (CUI) in pipingc systems consumes a significant percent of the maintenance budget in the petrochemical industry. Prevention of CUI by the use of (1) thermal spray aluminum, (2) stainless steel pipe, (3) expanded metal cages for personnel protection instead of insulation and (4) aluminum foil wrapping are discussed in terms of long term protection, installed cost and Life cycle cost.
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