Preparation and Corrosion Resistance of Graphene/Nickel Alloy Composites by Laser

With the rapid development of modern industry, the corrosion resistance of metal materials in extreme environments has become one of the key factors restricting the progress of many industries. As one of the thin corrosion resistant materials, graphene has attracted extensive attention and research in the field of metal protection in recent years due to its unique physical and chemical properties. In this paper, graphene films were prepared in situ on the surface of nickel alloy (Inconel625) by laser method, and their electrochemical properties were studied. The results showed that at 300 W laser power, the corrosion rate of graphene/nickel alloy composite in NaCl solution at 25 ℃ and NaCl solution at 70 ℃ was 56% and 83% lower than that of nickel alloy without graphene protection, respectively. In H₂SO₄ solution at 25 ℃ (pH=3), the corrosion current was 1.233×10^-6A/cm². The self-corrosion potential is -0.552 mV, and the corrosion rate is 0.0141mm/year, which is 88% lower than that of nickel alloy. The results of immersion corrosion experiments show that graphene can protect nickel alloy substrate in H₂SO₄ solution. The excellent corrosion resistance of laser-grown graphene benefits from its own unique barrier properties, excellent chemical stability, and a close bond with the metal substrate, which makes it show great application potential and value in the field of metal material protection.