Preparation method of metal preservative layer

Abstract

The invention relates to a preparation method of a chemical nickel-plating phosphorus alloy clad layer on the surface of a copper alloy for preventing seawater corrosion and sea biological defile. The method comprises the following five technical processes: deoiling; derusting; activating; carrying out chemical plating; and carrying out post-treatment. In the plating solution of the metal preservative layer, sodium hypophosphite is used as a reducing agent, nickel sulfate is used as a main salt, and a complexing agent, a buffering agent, a stabilizer and the like are added. The components of the plating solution and the chemical plating process parameters are optimized by using a uniform design technique and a single factor experiment method, so that an active surface can be formed. Chemical reduction-deposition is carried out on the nickel phosphorus alloy clad layer under a certain chemical plating condition. By adopting the preparation method provided by the invention, the chemical plating process is safe and stable, the clad layer is uniform, and the prepared clad layer is long in service life, smooth in surface and small in noise, and has a cathode protective effect on a copper alloy propeller matrix and is capable of reducing sea biological defile.

Description

Technical field: [0001] The invention belongs to the technical field of metal anticorrosion, and relates to a method for preparing an electroless nickel-phosphorus alloy coating for preventing flowing seawater corrosion and marine organism fouling on a copper alloy surface. technical background: [0002] At present, the propellers of some high-performance ships are made of various copper alloy materials. During the operation of the ship propeller, it forms a relative high-speed motion with the sea water, which makes the surface of the propeller form an extremely complex flow state, and the surface of the propeller has serious erosion (wear) corrosion and cavitation corrosion. At present, the commonly used methods to prevent erosion (abrasion) corrosion and cavitation corrosion include: choosing corrosion-resistant materials such as stainless steel to make propellers, but there are problems such as intergranular corrosion; designing and adopting scientific propeller structure...

AI Technical Summary

Problems solved by technology

[0011] For the corrosion and marine biofouling of the propellers of high-performance ships, in addition to the use of corrosion-resistant materials and scientific propeller structure design, the existing methods of protecting the propeller surface by cathodic protection and coating protection are difficult to solve well Corrosion problems in propeller operating conditions

At present, the antifouling coating used on the surface of the propeller is not ideal, and it cannot have the corrosion resistance of flowing seawater