Corrosion Science 225 (2023) 111618

Dense Cr/GLC multilayer coating by HiPIMS technique in high hydrostatic pressure: Microstructural evolution and galvanic corrosion failure

Shuyu Li#, Hao Li#, Guanshui Ma*, Jing Wei, Guangxue Zhou, Yan Zhang, Peng Guo*, Peiling Ke, Aiying Wang*

The dense Cr/GLC multilayer coatings were fabricated by high power impulse magnetron sputtering (HiPIMS) with various duty cycles. HiPIMS-deposited GLC coatings with high density displayed the lower corrosion current density by five times than DC- deposited GLC, due to the higher C+ ionization rate and larger incident ions energy. Noted that, after 425 h immersion with 15 MPa, though a laminar-like spallation occurred in the Cr/GLC interfaces instead of the coating/substrate interfaces, the lower galvanic corrosion current density was partic ularly achieved at 2.04 ×10 ⁹ A⋅cm² for the HiPIMS-coatings with reduced porosity, emulating an excellent tolerance of long-term corrosion resistance for deep-sea.   

URL：https://doi.org/10.1016/j.corsci.2023.111618