Bright black parts of the surface _ _ Humen black gold trillion Hardware

 After the first immersed in a solution of copper sulfide solution impregnation, or can be obtained from the reaction between copper sulfate and sodium arsenite green film: Orange film from antimony potassium tartrate and hydrogen sulfide obtained; bronzer can contain chlorine iron mixed solution of oxalic acid or ferrous sulfate, potassium ferrocyanide and potassium permanganate impregnated obtained ferric hydroxide generated lakes with gallic acid or gallic acid pyrophosphate reconcile, make it into dark. With 0.4 parts of chromium trioxide, 0.35 parts of sodium dichromate, 0.08 part of sodium fluoride, an aqueous surfactant solution (C9- alkylphenol ether) 0.5 parts dubbed, pH value 1.8, 50 ° will pass aluminum stearate treatment (50μm) immersion can be disseminated to give a pale yellow aluminum. The six gold dissolved in aqua regia mechanical metal surface black, with the amount of distilled water to dilute the other 30 parts lime dissolved 160 parts of distilled water, 2 hours later, the gold was added to the lime solution, still 5-6 hours, tossed away the upper surface of the black water, machinery, gold was precipitated calcium chlorine; then add 1000ml of water, then add sodium thiosulfate, heated for 10 minutes, not boiling, filtered, and the aluminum dipped to blond. The cobalt acetate 10-30g / L at 50 degrees dip aluminum 2 minutes after cleaning, then immersed containing potassium permanganate 5-30g / L solution of metal parts black, processing at 30 degrees 2 minutes, you can get the bronze. Exchange membrane electrolysis of sulfuric acid contains a considerable amount of free sulfur in some dilute salt solution, leaving the film with colored heavy metal compound, see Table -11. Coloring layer with ammonia solution prior to washing to remove sulfuric acid remaining in the pores, it will give the sulfide dissolved generated reduced, thus enhancing the color tone of the film linked to anodizing and plating jig used is different, the use of a Electroplating with similar hooks for hanging with anodized fixture is inappropriate, because the fixture and workpiece surface oxide film will quickly when anodizing, in this process a little loose with the workpiece fixture that will change the contact position, hindering current passing end, the jig having elasticity must be used to clamp the workpiece. The only way to make the anodizing process normally. Bright black parts of the surface _ _ Humen black gold trillion hardware provided by the Dongguan City trillion surface treatment plant. Dongguan City trillion surface treatment plant (www.jinzhao168.com) strong, credible, in Dongguan, Guangdong and other hardware accessories industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the gold hardware trillion into the brilliant and you work for a better future!