parts of organic amine between 0 3 and 5 weight parts of phosphoric acid and between 0 5 and 8 weight parts of phytic acid the nonylphenol polyoxyethylene ether is used as an emulsifier a wetting agent a dispersing agent a penetrant a cleaning agent and a solubilizer the organic amine is an organic surfactant an organic compound and can reduce the surface tension alter the surface physico chemical equilibrium conditions so as to wet the solder and the welded metal reduce the oxides and improve the soldering capacity the phosphoric acid is used as a catalyst of organic reaction an additive of refractory materials a treating agent for activated carbon and so on the phytic acid is used as a chelating agent an antioxidant an anti corrosion agent for metals and so on upon preparation the organic amine was heated to between 60 and 100 u00b0 c the nonylphenol polyoxyethylene ether added slowly and stirred for between 3 and 5 min to yield a mixture the mixture was cooled to 60 u00b0 c and then the phosphoric acid and the phytic acid were slowly added with stirring for between 10 and 15 min another anti oxidative agent for molten metal comprises between 51 19 and 91 19 weight parts of nonylphenol polyoxyethylene ether between 5 and 20 weight parts of cyclohexylamine hydrobromide between 3 and 15 weight parts of diphenyl guanidine hydrobromide between 0.