Mobile phone shell surface treatment technology

Abstract

A mobile phone shell surface treatment technology comprises the following steps: step one, polishing to obtain a mirror surface: polishing an aluminum (or magnesium) alloy mobile phone shell to obtaina mirror surface; step two, removing oil and wax; step three, zinc deposition: soaking the aluminum (or magnesium) alloy mobile phone shell into a zinc deposition solution to form a compact and uniform zinc layer on the surface of the mobile phone shell, and then washing the mobile phone shell by water; step four, nickel plating: adding a surface alloy catalytic liquid into a nickel plating tank,controlling the pH value of the surface alloy catalytic liquid in a range of 4.6-4.8, heating the surface alloy catalytic liquid until the temperature of the surface alloy catalytic liquid reaches 75-95 DEG C, and soaking the mobile phone shell in the surface alloy catalytic liquid to form a coating with a thickness of 5-15 [mu]m on the surface; step five, washing the mobile phone shell by waterand drying; step six, polishing; step seven, removing oil and wax; and step eight, carrying out PVD coating and coloring. The technology is energy-saving and environmentally friendly. The coating is compact. The porosity is small. The hardness is high. The coating is firm and uniform. The appearance is bright, the texture is good, the luster is high, the cost is low, and the yield is high.

Description

technical field [0001] The invention relates to the technical field of cell phone shell appearance treatment technology, in particular to a cell phone shell surface treatment process. Background technique [0002] At present, the commonly used metal surface treatment processes at home and abroad mainly include phosphating, impregnation, electroplating direct current, oxidation blackening, dacromet, electroless plating and other processes, but each technology has its weaknesses, and the most important thing is that it does not meet the requirements. National environmental protection requirements, especially the electroplating process is the most widely used, and its technical and pollution problems are also the most serious. The equipment required for electroplating is mainly DC power supply, nickel plating tank anode and power wire, as well as a plating solution prepared according to a certain formula, and some auxiliary equipment and management equipment, such as filters, h...

AI Technical Summary

Problems solved by technology

[0005] However, the appearance treatment of the aluminum alloy or magnesium alloy mobile phone casing by the above-mentioned process has the following defects: 1. The electroplating solution has strong acidity and strong corrosiveness, and the antenna groove will be corroded by the electroplating solution, which has a high defect rate and is difficult to apply on a large scale; 2. The coating is very thick, usually above 50 μm. 3. Additional current needs to be applied, the coating is not uniform enough, and the energy consumption is large, which is not energy-saving and environmentally friendly. Moreover, the current mobile phone is developing in a light and thin direction, and the thickness of the coating is strictly controlled. The process and appearance are difficult to meet customer requirements, and the thicker the coating, the more unstable, so there is still room for improvement

The Bondel method makes the zinc precipitation solution multi-alloyed, which changes the bonding force of the coating. At the same time, the zinc precipitation solution containing cyanide has always dominated the market, because the presence of cyanide can obtain smoother, denser, more uniform and granular coatings than zincate alone. Small zinc-precipitated layer, but cyanide meets acid to produce hydrocyanic acid, which brings great harm to the environment and the health of operators. How to take into account environmental protection and safety, and obtain a coating that meets the requirements of bonding strength has become an urgent problem to be solved