Chemical modification technology of chemical nickel phosphorus plating alloy coating

Abstract

The invention provides a process for preparing a sodium styrene sulfonate and acrylic acid modified nickel phosphorus plating alloy coating by respectively using a gamma-ray irradiation / chemical grafting technology. A polytetrafluoroethylene emulsion solution, a fluorocarbon cationic surfactant, sodium styrene sulfonate, acrylic acid and the like are used as raw materials, sodium styrene sulfonate and acrylic copolymers are respectively and uniformly grafted in a nickel phosphorus plating alloy coating through the gamma-ray irradiation / chemical grafting technology so as to enable the surface of the coating to be loaded with sulfonic acid groups and carboxylic acid groups which have cation selection penetration property, thereby effectively inhibiting and slowing the migration and the penetration of invasive chloride ions to the inner part of the coating, and improving the property of the conventional nickel phosphorus plating alloy coating resisting point corrosion, gap corrosion and intergranular corrosion caused by the invasive chloride ions. The sodium styrene sulfonate and acrylic acid modified nickel phosphorus plating alloy coating improves the corrosion property of the nickel phosphorus alloy coating in a sodium chloride medium, and expands the application to the fields of petrochemical complex, pump manufacture industry and the like.

Description

technical field [0001] The invention relates to the improvement of the corrosion resistance of the electroless nickel-phosphorus alloy coating, in particular to a method using polytetrafluoroethylene emulsion, fluorocarbon cationic surfactant, sodium styrene sulfonate and acrylic acid as raw materials, and applying gamma rays Irradiation / chemical grafting technology, a preparation process for modifying the nickel-phosphorus alloy coating. Background technique [0002] Corrosion of metal materials such as iron and steel pervades various application fields of the national economy, and brings huge economic losses every year. According to surveys and studies in developed countries, the annual economic losses caused by corrosion of metal materials account for 2% to 4% of the gross national product. The economic loss caused by corrosion in my country is more than 20 billion yuan every year. Doing a good job in the corrosion and protection of metal materials is an important measure...

AI Technical Summary

Problems solved by technology

Chloride ions are corrosive ions that easily penetrate the metal substrate through the surface of the nickel-phosphorus coating. When they come into contact with the protected metal material, they usually cause pitting corrosion, crevice corrosion and intergranular corrosion of the metal material, resulting in nickel-phosphorus plating. Loss of anti-corrosion performance of alloy coating

At present, most scholars still implement nickel-phosphorus coating sealing treatment or use nickel-phosphorus multi-element alloy coating and nickel-phosphorus composite coating to inhibit the damage of aggressive chloride ions in the corrosive medium to metal materials through the mechanical barrier effect, and have not fundamentally eliminated The harm of chloride ions to metal materials ultimately limits the application of nickel-phosphorus coatings and their composite coatings in various fields