Cr/GLC multilayered coating in simulated deep-sea environment: Corrosion behavior and growth defect evolution

In this work, the corrosion behavior of the multilayered Cr/GLC coating was evaluated in artificial seawater by comparison at an atmospheric pressure (1 atm) and a higher hydrostatic pressure (300 atm). The results revealed that the corrosion resistance of the coating was more favorable at 1 atm, but the hydrostatic pressure deteriorated coating protectiveness significantly by rapidly accelerating seawater diffusion through the growth defect and promoting the exposure of the substrate. The localized corrosion induced by the penetrating defect became more susceptible. This study is helpful to bring forward the significant guideline to fabricate the dense coating for deep-sea applications.