Electroplating and polishing processes, the two surface treatment methods used together is not conflict, but also very common;So what are the characteristics and principles of each process?
Polishing: mirror stainless steel plate is through the use of mechanical, chemical or electrochemical polishing process, the surface roughness of the stainless steel substrate greatly reduced, so that the surface of the substrate becomes bright, flat, the surface of BA, 2B, No.1 stainless steel processing into similar to the mirror surface.According to the surface roughness of the stainless steel surface to define the accuracy of the process;It is usually divided into 6K, 8K and 10K.
There are three common polishing methods:
Advantages: slightly higher use frequency, high brightness, good flatness, and processing and easy, simple operation;
Disadvantages: producing dust, unfavorable to environmental protection, unable to process complex parts
Advantages: high processing efficiency, fast speed, high processing complexity of parts, low processing cost
Disadvantages: low brightness of workpiece, harsh processing environment, not conducive to environmental protection
Advantages: mirror luster, process stability, less pollution, excellent corrosion resistance
Disadvantages: high upfront investment cost
Electroplating: it is the use of electrolysis to make the metal surface on a layer of metal film process so as to prevent corrosion, improve wear resistance, electrical conductivity, reflective, the most important also increase the perception, we see the stainless steel products on the rose gold, titanium gold, sapphire blue and so on various colors
Stainless steel color plating process is as follows: polishing – oil removal – activation – plating – closure.
Workpiece polishing: the smooth and bright surface of the workpiece is a prerequisite for the display of bright metal colors.Rough surface results in dull and uneven color, or many colors appear at the same time.Polishing can be done mechanically or chemically.
Oil removal: oil removal is an important condition to ensure uniform and bright color coating.Chemical and electrolytic methods can be used.If chemical polishing is used, remove the oil before polishing.
Activation: activation is one of the key factors for the quality of stainless steel color coating.The surface of stainless steel is easy to passivation, passivation on the surface is difficult to cover color coating or coating poor bonding.The activation of stainless steel can also be carried out by chemical and electrochemical methods in a solution of 30% sulfuric or hydrochloric acid.
Electroplating: in the salt solution containing pre-gold-plated group, the base metal of the plated group is used as the cathode, and the cations of the pre-gold-plated group are deposited on the surface of the base metal by electrolysis.This is to improve the durability of color coating and prevent contamination measures, is an indispensable step.Metal seal coating or dipping may be used.
Post time: Jun-21-2019