Your flux has only normal temperature, Zncl2 and HN4CL attachment
will be slowly, and the flux is not easy to be dry on the working
piece, resulting in the zinc explosion when the working pieces get
into the zinc tank. Burning tail gas heat recycling system without
extra heating source, by heat exchanger to keep the temperature
60~70 °, the density of Zncl2, NH4CL reduced considerably, and also
increased the uniformity of Zncl2, NH4CL attachment on the working
piece, and the zinc layer will be more uniformly and good
galvanization result.