Coating for preventing marine biofouling and preparation method thereof

A coating for preventing marine biofouling, consisting of an antifouling cladding layer, a corrosion-resistant primer cladding layer, and a metal substrate, with the corrosion-resistant primer cladding layer being between the metal substrate and the antifouling cladding layer, wherein:

• the antifouling cladding layer is a metastable-phase antifouling cladding layer;
• the antifouling cladding layer comprises a dispersedly distributed Fe-rich precipitation phase and a Cu-rich solid solution containing supersaturated Fe, and the Cu-rich solid solution containing supersaturated Fe is a Cu—Fe—Sn—Si—P copper-based solid solution;
• the antifouling cladding layer is prepared by a raw material of a Cu—Fe—Sn—Si—P alloy powder;
• the Cu—Fe—Sn—Si—P alloy powder consists of the following raw materials in mass percentage:
• Fe:
• 8% to 40%;
• Sn:
• 0.3% to 8%;
• Si:
• 0.1% to 0.5%;
• P:
• 0.1% to 0.5%;
• and Cu as a balance;
• the metal substrate is one of a steel substrate and an aluminum alloy substrate;
• the corrosion-resistant primer cladding layer is prepared by a raw material of a Ni—Cr—Mo—Nb—Si alloy powder;
• and
• the Ni—Cr—Mo—Nb—Si alloy powder consists of the following raw materials in mass percentage:
• Cr:
• 20% to 24%;
• Mo:
• 14% to 18%;
• Nb:
• 1% to 1.5%;
• Si:
• 0.5% to 1%;
• and Ni as a balance.