溶融Zn-A1合金めっき皮膜が高張力鋼の腐食疲労き裂に及ぼす影響

概要

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Fatigue crack initiation and propagation behaviors under corrosive conditions were examined using high tensile steel specimens treated by Hot-Dipped Zn-5%Al and Zn-55%Al-1.6%Si alloy coating. Corrosion rate of the coating and the fatigue crack initiation in the steel were examined first. Then the sacrifice anticorrosive effect for the fatigue crack propagation was examined. As the result, the following conclusions were obtained.(1) After the coating vanished, the corrosion rate of the base metal was slower than that of the uncoated case. Especially, the Hot-Dipped Zn-55%Al-1.6%Si specimen showed the slowest corrosion rate.(2) The number of cycles necessary to initiate the fatigue crack in the coating vanished specimen is larger than that for the uncoated specimen.(3) When the stress intensity factor falls below 31 MPa√m, the crack propagation rate by the use of Zn-55%Al-1.6%Si anode, becomes slower than that under atmospheric air condition.From the above facts, the Hot-Dipped Zn-55%Al-1.6%Si alloy-coated steel exhibited excellent properties superior to the Zn-5%Al alloy-coated steel with respect to the initiation and propagation of corrosion fatigue crack.
社団法人表面技術協会の論文
2003-07-01