Patent ID: 8871037

Claim:
A method of carrying out a diffusion treatment for a coating of a steel engineering part to increase resistance to marine climate, comprising: first step, pre-treating the part; second step, preheating the part in a furnace in a protective atmosphere; third step, submerging and turning the preheated part in a plating solution for 1-5 minutes, wherein said plating solution comprises in mass percentages: Zn: 35-58%; Si: 0.3-4.0%; Re: 0.02-1.0%; microalloy elements: 0.01-6.0%; nanometer oxide particle reinforcing agents: 0.01-1.0%; and Al: reminder; wherein said microalloy elements are selected from the group consisting of Mg, Ti, Ni, and a combination thereof; wherein said nanometer oxide particle reinforcing agents are selected from the group consisting of TiO 2 , CeO 2 , and a combination thereof; and fourth step, subjecting the plated part to a diffusion treatment in a vacuum furnace at a temperature of 800-950° C. for 1-3 hours, then reducing the temperature gradually, followed by taking out the diffusion treated part, thereby forming a diffusion layer on a substrate of the part, through diffusion of atoms at an interface to achieve a metallurgical combination between the coating and the substrate.