点状腐蚀对铝壳船船体板材力学性能影响研究

目的为铝壳船船体不同腐蚀状态板材相应修换要求的提出提供试验数据支持。方法针对服役10年的铝壳船船体板材,开展不同腐蚀情况无明显腐蚀区、穿孔点蚀周围区、多点蚀区的铝壳船船体板力学性能的研究。结果服役铝板无点蚀区,抗拉强度损失量为9.6%;点蚀深度越大,力学性能损失越大,最大点蚀深度为87.7%时,抗拉强度损失率达56%。相同点蚀覆盖面积试样,点蚀深度较大的,力学性能损失较大。结论影响铝合金船体板力学性能的点蚀参数中,点蚀深度影响较大。

Effect of Pitting Corrosion on Mechanical Properties of Pull Plates on Aluminum Ship

Objective To provide the experimental data support for repairing and replacing plates for aluminum hull ship under different corrosion conditions. Methods The mechanical properties of the plate of the aluminum hull ship with different corrosion conditions (areas without apparent corrosion and with penetrating pitting and multipoint pitting) in service for ten years were studied. Results The aluminum plate in the service had no pitting. Its tensile strength was as small as 9.6%. The greater the depth of pitting was, the greater the loss of mechanical properties was. When the maximum pitting depth was 87.7%, the loss rate of tensile strength reached 56%. The mechanical properties of the sample with the same point corrosion cover area were lost more with the greater depth of point corrosion. Conclusion The depth of point corrosion has a great influence on the mechanical prop-erties of the plate of the aluminum hull.