First, raise awareness and strengthen process management
With the development of market economy, the strengthening of electroplating process management and the improvement of product quality have become imperative. However, in the contact and practice, the author found that many process failures occurred and the defects of product quality were not due to problems in the process itself, nor were the errors in the process recipes, but rather defects in process management. In particular, ignoring the specification of the front and back two processes, a series of defects such as fogging (low layer), blistering, bright skin, yin and yang, patterns, and water traces, etc. occur, resulting in an increase in the rate of product rework, rising costs, and credibility. affected. The two processes before and after the electroplating process are the easiest to solve, but they are also the most difficult to implement. There is mainly a misleading view on the ideology of the operator, namely: "We did it the same way." Thus, there has always been a problem with process management. To this end, raising awareness and putting the process management in the first place are the first barriers to eliminating the ills of the process.
Second, common diseases in copper-nickel-chromium system:
The system says that the scope of this system is relatively large. At present, more widely used processes are:
1. Copper cyanide - bright nickel - chromium
2. Copper cyanide - copper brilliant - chromium
3. Dark Nickel - Bright Acid Copper - Chrome
The above processes are summarized as follows:
1. Alkaline copper bath: rough coating, color pig liver color or dark red, anode easy passivation, high working voltage.
2. Rolled bright nickel plating bath: high working voltage, low current efficiency, insufficient brightness, plating time does not match with the brightener specification, long time.
3. Hanging nickel plating: dark areas of small currents are dark, black, and poor plating ability.
4. Bright acid copper trough: The light ratio is misaligned and difficult to adjust.
5. Copper-nickel slots are susceptible to burrs, flower fog, and shell skin.
6. Plating antenna rods often have a small amount of shell skin.
The main reasons for the existence of these diseases and guidelines for their correction can be considered from the following aspects:
1. According to the requirements of the technological process, every process of the process is perfected, especially the cleaning process and the activation process.
2. The general process composition of the cyanide copper plating bath should be controlled at:
Pre-plated copper: free NaCN:Cu=0.6-0.8:1
General copper plating: free NaCN:Cu=0.5-0.7:1
In copper plating solutions containing potassium tartrate or thiocyanate:
Hanging plating: free NaCN:Cu=0.6-0.6:1
Barrel plating: free NaCN:Cu=0.6-0.7:1
3. Solve the blistering of the coating, shell skin; first check the pre-treatment of oil removal and rust removal process. What I need to warn about here is that different oils must be selected for different oil removal methods. We cannot listen to this introduction. The one propaganda should be used because the various parts are in shape and the polished oil traces have their own Different, plus different materials, at the same time to use weak base or strong acid to the oil method, the effect is different. For example, the shell skin of the antenna mast is mainly due to the problems of degreasing and throwing, and the second is the structural reason of the hanger. Because copper pieces cannot be de-oiled with high temperature and strong alkali, everyone may try.
4. To solve the problem of unbalanced and difficult-to-control ratio of brighteners in bright acid copper, it is mainly to improve the technical level of enterprises and to maintain the management of professional and technical personnel. In particular, manufacturers who use MNSP must find a way to add experience for their own products. Many manufacturers have established their own products based on the added quantity, which has been relatively stable.
Secondly, choose brighteners that are more simple to add: "330", "991" and other series of easy-to-control, bright and good brighteners, which can quickly and well solve the imbalance of the disease.
With the development of market economy, the strengthening of electroplating process management and the improvement of product quality have become imperative. However, in the contact and practice, the author found that many process failures occurred and the defects of product quality were not due to problems in the process itself, nor were the errors in the process recipes, but rather defects in process management. In particular, ignoring the specification of the front and back two processes, a series of defects such as fogging (low layer), blistering, bright skin, yin and yang, patterns, and water traces, etc. occur, resulting in an increase in the rate of product rework, rising costs, and credibility. affected. The two processes before and after the electroplating process are the easiest to solve, but they are also the most difficult to implement. There is mainly a misleading view on the ideology of the operator, namely: "We did it the same way." Thus, there has always been a problem with process management. To this end, raising awareness and putting the process management in the first place are the first barriers to eliminating the ills of the process.
Second, common diseases in copper-nickel-chromium system:
The system says that the scope of this system is relatively large. At present, more widely used processes are:
1. Copper cyanide - bright nickel - chromium
2. Copper cyanide - copper brilliant - chromium
3. Dark Nickel - Bright Acid Copper - Chrome
The above processes are summarized as follows:
1. Alkaline copper bath: rough coating, color pig liver color or dark red, anode easy passivation, high working voltage.
2. Rolled bright nickel plating bath: high working voltage, low current efficiency, insufficient brightness, plating time does not match with the brightener specification, long time.
3. Hanging nickel plating: dark areas of small currents are dark, black, and poor plating ability.
4. Bright acid copper trough: The light ratio is misaligned and difficult to adjust.
5. Copper-nickel slots are susceptible to burrs, flower fog, and shell skin.
6. Plating antenna rods often have a small amount of shell skin.
The main reasons for the existence of these diseases and guidelines for their correction can be considered from the following aspects:
1. According to the requirements of the technological process, every process of the process is perfected, especially the cleaning process and the activation process.
2. The general process composition of the cyanide copper plating bath should be controlled at:
Pre-plated copper: free NaCN:Cu=0.6-0.8:1
General copper plating: free NaCN:Cu=0.5-0.7:1
In copper plating solutions containing potassium tartrate or thiocyanate:
Hanging plating: free NaCN:Cu=0.6-0.6:1
Barrel plating: free NaCN:Cu=0.6-0.7:1
3. Solve the blistering of the coating, shell skin; first check the pre-treatment of oil removal and rust removal process. What I need to warn about here is that different oils must be selected for different oil removal methods. We cannot listen to this introduction. The one propaganda should be used because the various parts are in shape and the polished oil traces have their own Different, plus different materials, at the same time to use weak base or strong acid to the oil method, the effect is different. For example, the shell skin of the antenna mast is mainly due to the problems of degreasing and throwing, and the second is the structural reason of the hanger. Because copper pieces cannot be de-oiled with high temperature and strong alkali, everyone may try.
4. To solve the problem of unbalanced and difficult-to-control ratio of brighteners in bright acid copper, it is mainly to improve the technical level of enterprises and to maintain the management of professional and technical personnel. In particular, manufacturers who use MNSP must find a way to add experience for their own products. Many manufacturers have established their own products based on the added quantity, which has been relatively stable.
Secondly, choose brighteners that are more simple to add: "330", "991" and other series of easy-to-control, bright and good brighteners, which can quickly and well solve the imbalance of the disease.