| 摘要 |
PURPOSE: An electroless Ni plating method of an industrial ball valve and the Ni plated ball valve formed by the method are provided to obtain the favorable Ni plated ball valve without the corrosion and foreign materials on the surface of the high-capacity steel ball valve of a steel material. CONSTITUTION: An electroless Ni plating method of an industrial ball valve comprises: a step(S100,S200) of washing a high-capacity steel ball valve twice after acid degreasing the same with acid solution of sulfuric acid and hydrochloric acid, a surfactant, and an anticorrosive agent; a step(S300,S400) of washing the ball valve twice after electrolyte degreasing the same by applying voltage and current to a mixture of one kind or two kinds or greater selected from a group comprised of NaOH as a weak alkaline agent, Na2CO3, and Na3PO4; a step(S500,S600) of washing the ball valve twice after pickling the same with a mixture of ammonium hydrogenfluoride and sulfuric acid; a step(S700,S800) of washing the ball valve three times after dipping the ball valve into a Ni plating bath including nickel sulfate, sodium hypophosphite, citric acid, and thallium sulfate and electroless plating the ball valve with Ni; and a step(S900) of heat treating the ball valve after removing moisture from the ball valve by drying. [Reference numerals] (S100) Acid grease removing step; (S200,S400,S600) Washing step (two-step washing); (S300) Electrolyte grease removing step; (S500) Acid washing step; (S700) First NIi-P plating step; (S800) Washing step (three-step washing); (S900) Drying step
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