| The effect of cathodic polarization on environment sensitive cracking of 1 6Mn steel in seawater and the effect of different hot-dip ZnA1 alloy coating on stress corrosion cracking of I 6Mn steel in seawater were studied in this paper. The results show that l6Mn steel is not sensitive to stress corrosion cracking in seawater, but when cathodic polarization is done on l6Mn steel to prevent from uniform attacking, with the decreasing of cathodic potential, the susceptivity to environment sensitive cracking of l6Mn steel is increasing. From the morphology of the fractured surface of .1 6Mn steel at different cathodic potential, fractured surface of 1 6Mn steel at ?00mv has obvious brittle characteristics. Over cathodic protection will accelerate hydrogen brittlement of l6Mn steel in seawater. The effect of different hot-dip ZnAl coating on stress corrosion cracking of 1 6Mn steel in seawater is also studied. ZnAI alloy is in active dissolution state in seawater and not sensitive to stress corrosion cracking. But. l6Mn steel with ZnAl alloy coating is sensitive to stress corrosion cracking in seawater because where there are tiny cracks, ZnAI alloy coating has a function of sacrificing anode. Great anode and little cathode make l6Mn steel at cracks over protection. With the increasing of galvanic current between different ZnAl alldys and I 6Mn steel, elongation rate of 1 6Mn ? steel with hot-dip alloy coating decreases. I 6Mn steel in seawater is sensitive to hydrogen embrittlement.
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