Abstract:
This work presents the study of localized corrosion susceptibility in longitudinal welded joints of subsea gas pipelines. The preferential weld corrosion is due to the formation of galvanic cells between the weld metal, the parent metal and the heat affected zone. Two test solutions were considered, simulating condensed and dragged water. A test procedure has been developed for corrosion evaluation through immersion tests, galvanic current measurements with zero resistance ammeter technique and localized electrochemical tests through SVET. This work was focused on the advantages and limitations of these techniques in order to verify the susceptibility of the preferential welding corrosion in the welded joints. The results demonstrated that immersion tests and SVET clearly indicate the occurrence of preferential weld corrosion, while galvanic current measurement indicated only the anode and the cathode of the evaluated galvanic pair.
Reference:
CARDOSO, Juliana Lopes; PANOSSIAN, Zehbour; ANDRADE, Bruno de Barros; HENRIQUE, Marcos Luiz; ZUMPANO JUNIOR, Petronio; BAPTISTA, Ilson P. Test methods for identification of preferential weld corrosion susceptibility on welded joints of subsea pipelines. In: INTERNATIONAL CORROSION CONGRESS, 21., AND THE INTERNATIONAL CORROSION MEETING, 8., 2021, São Paulo. Proceedings… 3 p.
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https://escriba.ipt.br/pdf_restrito/177399.pdf
This work presents the study of localized corrosion susceptibility in longitudinal welded joints of subsea gas pipelines. The preferential weld corrosion is due to the formation of galvanic cells between the weld metal, the parent metal and the heat affected zone. Two test solutions were considered, simulating condensed and dragged water. A test procedure has been developed for corrosion evaluation through immersion tests, galvanic current measurements with zero resistance ammeter technique and localized electrochemical tests through SVET. This work was focused on the advantages and limitations of these techniques in order to verify the susceptibility of the preferential welding corrosion in the welded joints. The results demonstrated that immersion tests and SVET clearly indicate the occurrence of preferential weld corrosion, while galvanic current measurement indicated only the anode and the cathode of the evaluated galvanic pair.
Reference:
CARDOSO, Juliana Lopes; PANOSSIAN, Zehbour; ANDRADE, Bruno de Barros; HENRIQUE, Marcos Luiz; ZUMPANO JUNIOR, Petronio; BAPTISTA, Ilson P. Test methods for identification of preferential weld corrosion susceptibility on welded joints of subsea pipelines. In: INTERNATIONAL CORROSION CONGRESS, 21., AND THE INTERNATIONAL CORROSION MEETING, 8., 2021, São Paulo. Proceedings… 3 p.
Log into BiblioInfo/IPT-DAIT to access the PDF text. Document is password protected, ask Customer Service/Library-DAIT/IPT:
https://escriba.ipt.br/pdf_restrito/177399.pdf
