The electroplating coating has poor bonding, and the reason for this is!

【China Aluminum Network】 Metal products under natural conditions, the use rate is not high, but also easy to cause the loss of metal, so the conventional practice is to carry out the necessary protective treatment of the metal surface, to achieve a metal coating can effectively meet the appearance of the product, texture, Anti-corrosion, wear resistance and other aspects of performance, including electroplating is a commonly used metal surface treatment technology, is also widely used in the current one.

In the electroplating process production process, such as nickel-iron plating, aluminum-silver plating, iron-tin coating, etc., many manufacturers will encounter a common problem in the construction process: the bonding strength of the plating is not good. The main reasons for the lack of coating adhesion are as follows.

Poor pretreatment

When we electroplated the object, it may be that the silver-plated surface of the previous object was not cleaned, the surface may be covered with dust, or there may be other chemicals on the surface of the object. Causes the plating to affect the binding force.

Numerous experiments have proved that if there are non-metallic substances such as oil stains or rust on the surface of metal, sometimes the plating can also be deposited, but due to the oil “sandwich”, the flatness, bonding force, corrosion resistance of the plating layer are affected, and even the deposition is not continuous. , loose, and even peeling off the coating, so that the actual use value is lost. Therefore, pretreatment becomes an important process operation when metal plating is performed.

Pre-treatment surface technology adopts the oil-removing rust combo technology. By adopting a unique formula, on the one hand, oil removal and rust removal are performed synchronously, and oil removal through the original oil removal rust-washing-rust removal-washing is performed. Four processes. On the other hand, more than 80% of food-grade chemical raw materials are used in raw materials, which can be repeatedly added and recycled to save money and effort. Therefore, using this technology for pretreatment will not produce acid mist, which is conducive to environmental protection, labor protection and maintenance of production equipment, and can reduce the consumption of raw materials, and the use of safety, the product is non-flammable, non-explosive, non-toxic, odorless, on the human body It is also harmless. Can be widely used in metal and some non-metal in the coating, electroplating, electroless plating, rust seal, surface modification, surface membrane conversion process pretreatment.

Electroplating solution

In electroplating production, various harmful impurities enter the plating solution due to various reasons. A wide variety of impurities, there are roughly metal impurities, metal oxides, non-metallic impurities and various insoluble suspensions, organic impurities. The types of impurities contained in various baths are not the same, and tolerance to the same impurity is not the same. When one or more kinds of harmful impurities accumulate to a certain degree, it will affect the performance of the plating solution and the quality of the plating layer. Therefore, the plating solution cannot be treated until the impurities accumulate to cause damage.

Process Condition Control Factors

The control of process conditions directly affects the quality of the plating layer. Only by mastering and controlling the various process conditions for each plating can high-quality coatings be obtained. Temperature, current density, pH, plating time and other process conditions must match. If the hard chromium plating, the temperature and current density mismatches, there is a great impact on the cathode current efficiency, dispersion, coating hardness and brightness of the chromium plating solution.

Design factors

Product design personnel often pay attention to the factors such as the shape, size, and processing accuracy of the product parts in the drawing design process of the parts. There are not many considerations for the processing technology of the parts, especially the electroplating process, which brings many unnecessary troubles to the electroplating work. At the same time, it also has a certain influence on the quality of the product.

Production progress factors

Because many parts of the processing process need to span multiple workshops, and electroplating is always the end of a process, often the parts have not yet reached the electroplating workshop, the assembly plant has been assembled parts. This situation results in too tight a time limit, which often results in a delay in the work schedule. This can easily cause the plating time to fall short of the process requirements, or the work light at night can not be seen clearly, thus affecting the plating quality.

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