How to reduce the deplating rate of anodized aluminum wheels? The method is worth learning!

Aluminum wheelsPlating process The process is complex, mainly including pre-treatment, copper plating, copper polishing, Nickel plating, chrome plating and other processes, each process in the electroplating process is prone to produce defective products, and the deplating is in defective products Occupies a large part of it.

The deplating rate refers to the ratio of the number of wheels that need to be deplated due to the inability of replating to the total number of electroplated wheels. It is a very important indicator in wheel plating. Reducing the deplating rate is the main reason for improving the yield rate and saving costs. One way. Therefore, in the production process, it is very necessary to control the stripping rate within the minimum range, usually the stripping rate should be controlled below 8%. The complexity of the hub is also one of the factors that affect the deplating rate. The more complex the hub, the higher the possibility of deplating. To determine whether a defective wheel is to be deplated or repaired and replated, one must be familiar with the essentials of electroplating and master the type and severity of the fault.

Judgment of deplating wheels During the electroplating process, it is necessary to use classification analysis to prevent and control electroplating failures. Wheels with the following defects must be deplated: low blistering, peeling, severe deformation, large slag holes, bruises, severe pores, over-corrosion, etc. Statistics found that low-level blistering and peeling accounted for a considerable proportion. These two faults should be controlled during the production process, followed by slag holes and deformation. Table 1 briefly describes the definition, characteristics and analysis, location and control procedures of the defects of the deplating wheel hub.

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Determination and treatment of other defective products. Reducing the formation of defective products during the electroplating process is a fundamental measure to reduce the stripping rate. Therefore, familiarity with electroplating faults and treatment methods can reduce or prevent the production of defective products. After the formation of defective products, find the origin of the failure and take measures. After careful identification and repair, stripping can be avoided, and it is also an important measure to reduce the stripping rate. The repair methods for wheels with different surface conditions are different.

1 Judgment of brush-plated wheels

Brush plating is a process where there are slight defects on the surface of the wheel hub after copper plating. After brush plating, the nickel wire can be applied for subsequent electroplating without re-plating. Defects that need brush plating include bruises that are repaired by grinding copper to the substrate, breakdown during chrome plating, and low-level wear to dumb nickel (scars will be formed if brush plating is not performed). The area of ​​the defect must be small. The main factor that affects the success rate of brush plating is the defect to the substrate, which is prone to blistering after nickel plating. For the hub that penetrates to the base body, first adopt a special process treatment and then brush plating, which can improve the success rate of brush plating. The success rate of copper blank brush plating is higher, and the success rate of nickel blank brush plating is lower. The proficiency of the brush plating workers is also the key to the success rate of brush plating.

2 Judgment of returning copper wheels

Copper-returned wheels cannot be solved by brush plating processes, such as low-position large-area pinholes, low-position wheels that pass through to dull nickel, low-position copper-plated wheels that are white and polished, and high-zone burnt areas are large. and many more. The success rate of returning copper from the copper billet is relatively high, which can be above 95%. The success rate of returning the copper from the nickel billet is not high. The main manifestations are peeling and blistering. Therefore, the amount of nickel returning to the copper should be minimized in the actual process.

3 Judgment of returning nickel wheels

Nickel-returned wheels are usually produced in defective nickel-plated nickel wires and returned goods. Defective nickel wires are mainly caused by pitting, burrs, watermarks, nickel marks, and matt. Due to the high hardness of nickel, it is difficult to remove defects such as pits and burrs during the polishing and repairing process. In order to avoid the recurrence of defective products in the returned nickel parts, strict requirements are required for the polishing and quality inspection of nickel blanks. Watermarks are prone to appear on nickel-returned parts. The main reason is the problem of electric degreasing. High alkalinity and poor washing can easily cause watermarks.

4 Handling of returned defective products

First, re-inspect the returned wheels, and then analyze the reasons for the return, and then adopt different treatment methods for the wheels of different reasons. Bumped wheels must be polished and repaired before processing, and severely deformed wheels must be stripped. Peeling and blistering wheels are generally stripped.

Summary

(1) The control of the stripping rate is not in a certain link, but the entire process must be controlled to minimize the stripping rate, including material issues and electroplating process control issues. There are problems with the polishing process, and so on. (2) After the production of defective products, it should be judged according to the types and characteristics of stripping whether it is necessary to strip or repair methods to remedy it, which can also reduce the stripping rate and save human resources and costs for the company.