FATIGUE CRACK GROWTH FEATURE OF STEELS UNDER CATHODIC PROTECTION IN SEA WATER

Acta Metall Sin

1991, Vol. 27

Issue (2): 119-123 DOI:

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FATIGUE CRACK GROWTH FEATURE OF STEELS UNDER CATHODIC PROTECTION IN SEA WATER

WU Xinhua;ZHU Ziyong;KE Wei Institute of Corrosion and Protection of Metals; Academia Sinica; Shenyang

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WU Xinhua;ZHU Ziyong;KE Wei Institute of Corrosion and Protection of Metals; Academia Sinica; Shenyang. FATIGUE CRACK GROWTH FEATURE OF STEELS UNDER CATHODIC PROTECTION IN SEA WATER. Acta Metall Sin, 1991, 27(2): 119-123.

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Abstract The fatigue crack growth feature of the offshore steels WFG36Z andA537CL1 under cathodic protection in sea water environment has been investigated.The deposits of Ca and Mg compounds were found to retard the rate of crack growthwhich will be no longer increasing monotonously against △K, but form V-shaped curve with a minumum crack growth rate at certain value of △K. Moreover,the optimum protection potential range may be changed by the action of deposits.The best range for the steels WFG36Z and A537CL1 in sea water environment is-800—-900 and -1100—-1500 mV respectively, and the harmful range seems to bewithin -950—-1000mV.

Key words: fatigue crack growth cathodic protection deposit retardation

Received: 18 February 1991

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