SINGLE OVERLOAD RETARDATION OF A537 STEEL IN 3.5% NaCl SOLUTION UNDER CATHODIC POLARIZATION AND FREECORROSION CONDITION

J Chin Soc Corr Pro

1997, Vol. 17

Issue (2): 99-105 DOI:

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SINGLE OVERLOAD RETARDATION OF A537 STEEL IN 3.5% NaCl SOLUTION UNDER CATHODIC POLARIZATION AND FREECORROSION CONDITION

WEI Xuejun LI Jin KE Wei(State Key Laboratory of Corrosion and Protection; Institute of Corrosion and Protection of Metals; The Chinese Academy of Sciences; Shenyang 110015)

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Abstract The effect of single overload on corrosion fatigue crack growth rate under constant △K control was studied for A537 steel in air and in 3.5% NaCl solution at a cathodic potential of -1400mV (SCE) and under free corrosion condition. The results showed that the retarding propagation distance of crack was longer than the plastic zone size at the crack tip. Either in air or in 3.5% NaCl at the cathodic potential, the crack growth process following single overloading consisted of three stages: crack extension due to overload, deceleration of crack growth and resumption of crack growth rate. However, the crack extension stage was not observed for the specimen tested in the solution under free corrosion condition. Both the retarding propagation distance and retarding degree for corrosion fatigue crack propagation in the solution were smaller than those for fatigue crack propagation in air. The theoretical analysis indicated that the crack closure effect was mainly responsible for the change of crack growth retardation in corrosion fatigue.

Key words: Corrosion fatigue Overload retardation Cathodic polarization Free corrosion condition

Received: 25 April 1997

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WEI Xuejun LI Jin KE Wei(State Key Laboratory of Corrosion and Protection; Institute of Corrosion and Protection of Metals; The Chinese Academy of Sciences; Shenyang 110015). SINGLE OVERLOAD RETARDATION OF A537 STEEL IN 3.5% NaCl SOLUTION UNDER CATHODIC POLARIZATION AND FREECORROSION CONDITION. J Chin Soc Corr Pro, 1997, 17(2): 99-105.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1997/V17/I2/99

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