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Bolt Factory Tin Plating Process

  • Leader
    February 16, 2020
    Tin is a silvery white metal, non-toxic, with good weldability and ductility. Widely used in electronics, food, automobile and other industries. The tinning process for hexagonal flange screws is classified according to the PH value of the plating solution, and can be divided into two categories: acidic plating solution process and alkaline tinning process. Next, the [u]Bolt Factory[/u] will give you a detailed introduction.

    Acid tin plating has the advantage of fast plating speed. The coating is bright and fine and has good deep plating ability. The plating solution has strong tolerance to impurities and saves energy when operating at room temperature. The disadvantages of this method are poor dispersion of plating solution, high porosity of plating layer, inferior brazing to alkaline tin plating and hydrolysis of bivalent tin. Acidic tin plating of hexagonal flange screws can be divided into sulfate tin plating, fluoborate tin plating, chloride tin plating and other processes due to different conductive media.

    Sulfuric acid tin plating has low cost, easy control of plating solution, bright and fine plating layer, but poor dispersibility. The market application is very extensive. The advantages of fluoborate tin plating are fast plating speed, high current and good stability of plating solution. Widely used for continuous electroplating of hexagon nuts with flange, wire and strip. Disadvantages are high cost of plating solution, high toxicity and difficult wastewater treatment.

    Chloride tin plating is mainly in crystal grain tin plating. Its advantages are low cost, stable plating solution and white plating layer. The disadvantage is that the current is not high. The advantages of alkaline tin plating for [u]Hex Flange Screws[/u] are: simple composition, good dispersion of plating solution, fine plating layer, few pores and good brazing performance. Disadvantages are: high operating temperature, large energy consumption, narrow current application range, low current efficiency, inability to obtain bright coating, small hard coating and large influence on anode behavior.