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In this study, tension fatigue tests of grade-A marine mild steel with epoxy type of coating were carried out and the corresponding S–N curves with a survival probability of 97.5% are derived. Compared to the uncoated specimens studied previously, Epoxy coating has increased fatigue life of Mild steels by about 50% in the case of high cycle fatigue and fatigue limit by 6%. This improvement on fatigue strength is mainly due to crack-tip bridging phenomenon of coating which fills micro surface cracks and delayed surface crack propagation. The effect of surface finishing method on adhesion strength of Epoxy coating is investigated by pull-off tests. The DIC method is used to determine the in-plane strain distribution in the necking region of tensile test of uncoated specimens. The final image before fracture shows that the vertical and horizontal local strain in the necking position is 155 and 32%, respectively.

The effect of epoxy coating on the fatigue strength of grade-A mild steel