Hexagon bolts are a new type of corrosion-resistant coating that has been widely used. Hex bolt processing processes are mainly substrate, degreasing, descaling, coating, preheating, curing, and cooling. There are generally three methods of degreasing: degreasing of organic solutions, degreasing of water-based degreasers, and degreasing of high-temperature carbonization. Whether the degreasing is completely effective will directly affect the adhesion of the coating.
All hex bolts with rust or burrs are strictly prohibited from being applied directly. It is necessary to pass the deburring and deburring process. This process is preferably carried out by mechanical means to avoid pickling to prevent hydrogen embrittlement. The cleaned hex bolts that have been degreased and rusted must be surface coated as soon as possible by dip coating, spraying or brushing.
The workpiece of the hexagonal bolt wet film must be pre-baked at 120±20 °C for 10-15 minutes as soon as possible to evaporate the coating liquid. The pre-baked workpiece must be sintered at a high temperature of about 300 ° C for a sintering time of 20-40 minutes, or the temperature can be appropriately increased to shorten the sintering time. After the workpiece is sintered, it must be sufficiently cooled by the cooling system for post-treatment or finished product inspection.