Plastic plating-imitating gold plating process.
Huizhou Boluo Tenglong Technology Co., Ltd. serves you wholeheartedly! Mainly engaged in plastic hydroelectroplating processing, with plastic injection molding processing, mold processing and so on!
Hardware production has developed rapidly since the reform and opening up. In addition to the use of pure gold coating for specific high-grade products, 24K imitation gold plating is more common. In the decorative electroplating process, imitation gold plating is the most widely used electroplating process. Lighting, locks, ceiling fans, bags, lighters, glasses frames, tie clips and other products have a variety of appearance, but most of them are still gold coating, and there are many ways to obtain the gold appearance, such as real gold plating, copper zinc plating, copper tin or copper tin imitation gold, gold electrophoretic paint, gold glue technology and so on. Among them, imitation gold plating is a widely used process.
Cyanide plating solution is the most commonly used and stable in copper-zinc, copper-tin or copper-zinc-tin imitating gold plating solution. Domestic factories generally use their own alloy plating solution.
Technological conditions.
In addition to the effects of these main salts, the process conditions are also very important for imitation gold plating, such as:
The main results are as follows: (1) temperature is used as an auxiliary means of color blending, and the increase of temperature is beneficial to the electrolytic precipitation of copper and increase the red hue of imitation gold color. It is generally appropriate to adopt 40-50 ℃, which can reach 60 ℃ if necessary, which can be adjusted according to the needs of color and the composition of the solution. Temperature.
The rise of the solution can improve the conductivity of the solution and make the color uniform and bright. However, too high temperature will accelerate the decomposition and consumption of sodium cyanide, which is not conducive to the stability of the solution.
(2) current density. In order to obtain perfect imitation gold, it is required that the ratio of each metal and its ratio to the complexing agent should be satisfied that the amount of precipitation of each metal at a certain potential and current reaches the best proportion of imitation gold, in order to achieve repetitive accuracy of current control, in order to ensure the reproducibility of color, a special three-gear current timing controller should be used. The current controller consists of three adjustable time relays, which automatically turn on and off three voltage regulators according to the given time, and input the three step-down fixed voltages into a transformer in turn each time. After the output current is rectified, the three different sizes of the current are input into the gold-like slot according to the given voltage. The power supply device of this kind of imitating gold slot is different from that of other grooves, and the three-step current is divided into impulse current, transition current and imitation gold current. It is very important to control and select the time and size of each current, and the last gear is the most important.
(3) imitating gold time. The total time of each stage is 20: 30s, the length of impulse current is not caused by local scorch or the decrease of brightness, and the time of imitating gold current is to obtain a uniform imitation gold with sufficient chromaticity. The time of the third gear current should be reasonably distributed, and the impulse current time should not be too long, accounting for about 20% to 30% (25%); the transition current time should be slightly longer, accounting for about 40% to 45% (43%); the imitation gold current time should be just right, accounting for about 30% to 35% (32%).
In this time, the appropriate total thickness of imitation gold layer should be obtained. Too short time and too thin imitation gold layer can cause local discoloration and discoloration; too long imitation gold layer is too thick, which is harmful to the bright color of imitation gold. If the best imitation gold color cannot appear or is fully displayed in an appropriate period of time, fine-tuning or necessary adjustments should be made to the imitation gold plating bath when adjusting the corresponding current is not effective. The magnitude of the impact current is that there is no scorching on the outer surface of the whole part uniformly, and the magnitude of the imitation gold current is to obtain the ideal imitation gold.
Hot Tags: plastic plating-imitating gold plating process., China, suppliers, manufacturers, factory, custom, wholesale, buy, made in China
