Galvanized hexagonal bolts refer to the treatment of ordinary hexagonal bolts after degreasing, pickling and fluxing, soaking in molten zinc to obtain a zinc coating. It is characterized by durability, high reliability and time saving. Labor saving and excellent resilience. However, the Galvanized Hexagonal Bolts also have disadvantage, it is difficult to screw the bolt after plating, which affects the fitting of the screw. How to solve this problem?
At present, the following measures are often used to solve the problem of screwing difficulties after the hot-dip galvanizing of the threaded fittings, such as the backlash after the screwing of the screw parts, the reserved clearance is reserved, and the method of centrifugal enthalpy is adopted. The backlash method easily destroys the plating of the threaded part and even exposes the steel substrate, causing high-strength bolt rust. However, the over-range increases the nut diameter or the reserved clearance, the processing precision is difficult to meet the requirements, and it is easy to reduce the mating strength.
At present, it is more common in China to mechanically remove the residual zinc, but the effect is not satisfactory. In addition, people consider the hot-dip galvanizing process and the immersion time to improve the quality of the coating, but they have not solved the problem fundamentally.
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