Keyword: PCB circuit board, circuit board PCB, PCB
Circuit protection paint is also called electronic circuit board PCB applying, only the oil, moisture-proof paint, anti-corrosion coatings, waterproof glue, insulating paint, anti-corrosion paint, paint, dust, paint, salt mist protection paint anti-corrosion, only the paint, glue, etc., used circuit protective lacquer PCB circuit board with waterproof, moisture-proof, dustproof "three anti" performance and resistance to cold and hot shock, resistance to aging, ozone radiation resistant, salt fog resistance, resistance to corrosion, good vibration resistance, flexibility, adhesion and other performance.
Moisture is the most common of PCB, the main factors of the most destructive. Too much moisture will dramatically reduce insulation resistance between conductors, accelerate the decomposition, to reduce the Q value, and corrosion conductor. We often see PCB metal part played a patina is no anti-corrosion coating paint metal copper oxygen and water vapor, a common chemical reaction. And literally find hundreds of kinds of pollutants on printed circuit boards with the same destructive power. They lead with high - the same results of electronic deterioration, corrosion and even cause irreparable conductor short-circuit. Most commonly found in the electrical system of the pollutants, may be the process of the remnant of the chemicals.
These pollutants can help solvent, solvent mold release agent, for example, metal particles and ink mark, etc. Also has a group of main pollution is caused by human hands when he, such as human body oils, fingerprints, cosmetics and food residue scale. Operating environment also has a lot of pollutants, such as salt spray, sand, fuels, acids, and other corrosive steam and mold. The anti-corrosion paint coated on the PCB and components, when can be affected by adverse operating environment factors, can reduce or eliminate the electronic performance decline. If this only the paint can maintain its role of a satisfactory time, such as greater than the product of life, will be deemed to have the coating purpose. Even if only the layer is very thin, also to a certain extent, can be a very good withstand mechanical vibration and swing, thermal shock, and the operation under high temperature. Film can be used to make the plug in printed circuit board, of course, individual parts with or enough mechanical strength of the insulation concept, is wrong. Components must be to stuck in a mechanical way, and need to have their own applicable gap filling agent, so that to have double insurance to prevent the happening of the accident.
ATE is based on computer equipment fault diagnosis technology, after put into use, speeds up the test process, improve the speed of maintenance, also can prevent the occurrence of fault, thus improve the quality and performance of equipment. Ship electronic equipment there are many types of circuit board, here only consider the simple type digital logic circuit board ATE equipment design.
