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Can aluminum CNC metal machining parts be electroplated?

50   |   Published by VMT at Jul 08 2021

Generally speaking,surface treatment uses mechanical and chemical methods to form a protective layer on the surface of the aluminum CNC metal machining parts product to protect the fuselage, increase the corrosion resistance of the fuselage, increase the aesthetics of the product, and thereby enhance the value of the product. The choice of surface treatment type should first be based on the use environment, service life and human aesthetics. Of course, economic value is also a core consideration. The common chemical treatments of our aluminum products include chromization, painting, electroplating, anodizing, electrophoresis and other processes. Among them, mechanical treatment includes wire drawing, polishing, spraying, polishing and other processes. Of course, what we are going to talk about today is whether aluminum CNC metal machining parts products can be electroplated, so our VMT engineers will give you a comprehensive answer from process to economics whether aluminum CNC metal machining parts products can be electroplated.


aluminum CNC metal machining parts



Aluminum CNC metal machining parts products have the advantages of good electrical conductivity, fast heat transfer, light specific gravity, and easy forming. However, aluminum and aluminum alloys have disadvantages such as low hardness, non-wear resistance, intergranular corrosion, and difficulty in welding, which affects the scope of use. Therefore, in order to better avoid this problem, modern industry uses aluminum CNC metal machining part electroplating to solve this problem.



First of all, we need to know that our aluminum CNC metal machining parts can be electroplated. Electroplating aluminum can improve the decoration of aluminum, increase surface hardness and wear resistance, and is easy to weld. Electroplating reduces the coefficient of friction and improves lubricity. In terms of surface conductivity, corrosion resistance (including bonding with other metals), bonding force with rubber during hot pressing, aluminum reflectivity, dimensional tolerance repair, etc. Everything has been improved.



Generally, our electroplating process is roughly divided into degreasing -> alkaline etching -> activation -> zinc replacement -> activation -> electroplating (such as nickel, zinc, copper, etc.) -> chrome plating or passivation -> drying.



Common types of electroplated aluminum CNC metal machining parts include nickel plating (pearl nickel, sand nickel, black nickel), silver plating (face silver, thick silver), gold plating, zinc plating (color zinc, black zinc, blue zinc), copper plating (green drum) Copper, white tin copper, alkali copper, coke copper, acid copper), chromium plating (white chromium, hard chromium, black chromium), etc. Commonly used plating species, black plating, such as black zinc, black nickel and so on. Used in optical electronics and medical equipment. Improving the high-level decoration of the product will lead to gold plating. Silver is the best conductor of electronic aluminum CNC metal machining parts products, it is also possible, but the price is more expensive. Generally used for electrical conductivity of electronic products, such as electroplating of high-precision wire terminals Taking into account economic benefits, copper, nickel, and chromium will be used. They are also the most popular hybrid electroplating species in modern science. Whether it is decoration or corrosion resistance, they are currently the most popular electroplating varieties in the world. The price is low, and it can be used in sports equipment, lighting and most electronic industries. In addition, there are copper plating, zinc plating, hard chromium and so on.



The common abnormalities in the electroplating process include peeling, rough surface, yellowing of the aluminum CNC metal machining parts surface, low potential tendency, irregular surface, and surface fluffing. VMT engineers provided some improvement measures: 1. Peeling may be caused due to poor zinc replacement, too long or too short time, insufficient activation, incomplete pretreatment, and oil stains on the surface of the aluminum CNC metal machining parts.        


Aluminum CNC metal machining parts Improve:


1. Change zinc and re-determine the operating parameters such as replacement time, bath temperature, bath concentration and so on.


2. Insufficient activation, improve measures and change activation methods.


3.​The pre-treatment is not thorough, and there are measures to improve the oil stain on the surface of the aluminum CNC metal machining parts, and the pre-treatment should be strengthened.


4. The aluminum CNC metal machining parts surface roughness is caused by the discomfort caused by electroplating liquid brightener, softener, pinhole dosage, and the rough surface of the body itself. So we can choose to readjust the amount of additives and re-grind before electroplating.


5. Aluminum CNC metal machining parts yellowing of the surface is a low potential trend. Need to change the installation method, add an appropriate amount of locating agent.


6. The teeth with fluffy aluminum CNC metal machining parts surfaces are too dirty for the electroplating solution. Strengthen the filtration and do a proper bath treatment.



Aluminum CNC metal machining parts quality requirements



1. The aluminum CNC metal machining parts appearance is free from yellowing, pinholes, burrs, blisters, abrasions, scratches, etc.


2. The film thickness is more than 15um, and the salt spray experiment is 48 hours, reaching the US military standard 9 or more, and the potential difference is in the range of 130-150mv.


3. The binding force can pass the 60-degree bending test.


4. Aluminum CNC metal machining parts products in special environments can be changed accordingly.



Precautions for aluminum CNC metal machining parts electroplating operations


aluminum CNC metal machining parts


1. Aluminum alloy should be used as a hanger for the electroplating of aluminum CNC metal machining parts;


2. Each process after aluminum CNC metal machining parts etching must be carried out quickly, and the interval between processes should be as short as possible to avoid re-oxidation;


3. The second zinc immersion time should not be too long to avoid excessive corrosion;

4. Washing must be cleaned;


5. During the electroplating process, prevent intermediate power failure.



The above points are the knowledge of electroplating aluminum CNC metal machining parts. If you want more information, please contact the VMT aluminum CNC metal machining parts website for details.



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