Tin plating process for hexagonal bolts

Tin is a silver white metal that is non-toxic and has good weldability and ductility. Widely used in industries such as electronics, food, and automobiles. The tin plating process for hexagonal bolts is classified according to the pH value of the plating solution, and is divided into two categories: acidic plating process and alkaline tin plating process.
The advantage of acidic tin plating is fast plating speed. The coating is bright and meticulous, with good deep plating ability. The plating solution has strong tolerance for impurities and saves energy during room temperature operation. The disadvantage of Mina is that the dispersion ability of the plating solution is poor, and the porosity of the coating is high. Brazing is not as good as alkaline tin plating, and divalent tin is hydrolyzed. Acid tin plating on hexagonal bolts can be divided into processes such as sulfate tin plating, fluoroborate tin plating, chloride tin plating, etc. due to different conductive media.
Sulfuric acid tin plating has low cost, easy to control plating solution, bright and fine coating, but poor dispersion ability. The market is most widely used. The advantages of fluoroborate tin plating are fast plating speed, high current usage, and good bath stability. Widely used for continuous electroplating of flange nuts, wires, and strips. The disadvantages are high cost of plating solution, high toxicity, and difficulty in wastewater treatment.
Chloride tin plating is mainly used in crystal grain tin plating, with the advantages of low cost, stable plating solution, and clean white coating. The disadvantage is that the current is not very high. The advantages of alkaline tin plating on hexagonal bolts are: simple composition, good dispersion ability of the plating solution, fine coating, few pores, and good brazing performance. The disadvantages are: high operating temperature, high energy consumption, narrow range of current usage, low current efficiency, inability to obtain bright coating, small hard coating, and significant impact on anode behavior