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97017 EFFECT OF SCRATCHING ON GALVANIC CORROSION IN OIL AND GAS ENVIRONMENTS

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Product Number: 51300-97017-SG
ISBN: 97017 1997 CP
Author: H. Kaneta, T. Hara, H. Asahi
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Galvanic corrosion behavior in oil and gas environments when the metal specimens were mechanically scratched was investigated in electrochemical method by using material combinations from carbon steels to duplex stainless steels. Galvanic current and coupled potential soared by mechanical scratching and immediately started to decrease and finally returned to the value hefore scratching in both sweet and sour environments. Therefore, an increase in galvanic corrosion rate by scratching is negligible small for the long term and localized corrosion due to mechanical scratching does not occurrs. The change in coupled potential immediately tier scratching was small in sweet environments and large in sow environments. It is considered that in case of rapid forming corrosion film of less noble metal, galvanic current after scratching decreased rapidly, however, in case of slow forming corrosion film of less noble side, galvanic current after scratching decreased gradually. Keywords: galvanic corrosion, oil country tubular goods, carbon steel, stainless steel, mechanical scratch, wireline, sour environments, sweet environments
Galvanic corrosion behavior in oil and gas environments when the metal specimens were mechanically scratched was investigated in electrochemical method by using material combinations from carbon steels to duplex stainless steels. Galvanic current and coupled potential soared by mechanical scratching and immediately started to decrease and finally returned to the value hefore scratching in both sweet and sour environments. Therefore, an increase in galvanic corrosion rate by scratching is negligible small for the long term and localized corrosion due to mechanical scratching does not occurrs. The change in coupled potential immediately tier scratching was small in sweet environments and large in sow environments. It is considered that in case of rapid forming corrosion film of less noble metal, galvanic current after scratching decreased rapidly, however, in case of slow forming corrosion film of less noble side, galvanic current after scratching decreased gradually. Keywords: galvanic corrosion, oil country tubular goods, carbon steel, stainless steel, mechanical scratch, wireline, sour environments, sweet environments
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