S355 steel has many advantages and is widely used in the manufacturing of offshore platforms because of its strength, resilience to impact at lower temperatures and excellent weldability. Al coating by arc spraying is a manufacturing process of corrosion resistance specifically used on offshore platforms, and relevant research shows that Al coating with a thickness of 200 m has a service life of 30 years in seawater. In splash zones, offshore platforms’ legs are affected by seawater through the alternately hot days and cold nights. The binding performance of Al coating by arc spraying declines once the coating cracks appear, as seawater rapidly causes corrosion on the substrate of S355 steel, and the mechanical properties of legs are affected, causing a whole leg fracture to occur, which is an extremely grave situation and can cause an offshore platform disaster. Because of offshore platform locations, it is difficult to regularly carry out maintenance inspections of the Al coating on them. Therefore, Al coating by arc spraying needs additional.
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