Gold deposition is used by chemical deposition, through the method of chemical REDOX reaction to generate a layer of coating, generally thick, is a kind of chemical nickel gold deposit method, can reach a thicker gold layer.
The cooling metal block of the three-end voltage regulator must be well grounded. The grounding isolation belt near the crystal oscillator must be well grounded.
With the rapid development of mobile phone, electronics, communication industry, automatic driving, to a large extent, the PCB circuit board industry continues to grow and grow rapidly, people for the quality of PCB components, layers, weight, precision,
These PCBS are widely used in mechanically sensitive devices because the flexibility allows the board to resist vibration. Flexible PCB is more durable than traditional PCB, but flexible PCB manufacturing process is sensitive and complex.
At the same time, physical and chemical changes are formed on the surface of the functional groups of the gas composition, so as to improve the bonding force of copper plating, pollution removal and other plate loading effects.
At present, most automatic exposure systems use a solid-state camera to read the target image of the negative and substrate, and then calculate the difference as the basis for position correction.
the process requirements of PCB circuit boards in each industry have gradually improved. For example, gold and copper are used in the circuit boards of mobile phones and computers.
The following processes of PCB circuit board production need pure water cleaning: copper plating, gold plating, silver plating, nickel plating, tin plating. Can be used for multilayer circuit board, double layer circuit board and single layer circuit boar
which makes the direction of high frequency, high power and miniaturization. High signal power, high current and high voltage put forward higher requirements for PCB surface copper degree and hole copper thickness.
PCBA welding processing, usually PCB board has a lot of requirements, and must meet the requirements of the board to accept welding processing.
the polymer resin containing phosphorus nitrogen compounds will produce non-combustible gas when it is burned. This gas can isolate the surface and air of the resin combustion
printing material dry too fast, in the screen version dry plugging hole, printing speed is too fast, scraper strength is too high. Solution, should use volatile organic solvent slow printing material, with soft cloth stained with organic solvent gently cl
