One, electroanalysis the newer technology that casting photoelectricity to solve polishing is treatment of metallic surface adornment. It applies at the finish machining after the pretreatment before plating of metallic spare parts and plating, also can apply at the treatment of metallic surface alone. If electroanalysis polishing is commonly used at the metallic spare parts with complex external form, special tool and appliance and the adornment sex treatment of a variety of film and exterior precision work. Below certain condition, electropolishing also can be used replace onerous mechanical polish. Electroanalysis polishing has production efficiency is tall, the operation is convenient wait for an advantage. Defect is cost tall, operating period is brief, second birth difficulty. The mechanism of electropolishing is more complex. Among them mucous membrane theory thinks electropolishing process is medium, a kind of agglutinant film that has tall resistor rate was formed in zincous surface. The ply that this kind of mucous membrane is in than calix in the ply of microcosmic and raised place is small, current density is higher, deliquescent faster; And the current density that calix is in is inferior, deliquescent rate is slower, the ceaseless changeover that passes sunken position of protruding of period of time so is achieved gradually whole smooth, shining purpose. The electropolishing liquid that uses on production at present basically has: The polishing fluid that vitriolic, phosphoric acid, chromic anhydride comprises ① ; The polishing fluid that acid of Meng of ② vitriolic He Ning comprises; The mixture polish fluid that vitriolic, phosphoric acid, hydrofluoric acid and glycerine or similar compound comprise ③ . The electrochemistry polish of steely spare parts (the affects steely data sort of 1) material sort is very much, should use different polishing liquid to different steel products. (The influence phosphoric acid of all sorts of 2) elements is the bases of polishing fluid. The phosphatic conglutinate that it generates is in zincous surface, main effect has in polishing process. Vitriolic and OK raise polishing rate, but content cannot exorbitant, lest cause,corrode. Chromic anhydride can improve polishing result, make the surface shining. Current density has very big effect to polishing quality, should use different current density to different solution, current density is too low, full smooth effect is poor, exorbitant meeting has been caused corrode. Temperature has certain effect to polishing quality, but not be main factor. (① of of 3) operation note is new the solution that make up should be accumulated in big cathode face (cathode area is more than zincous area severalfold) undertake electrify is handled below the circumstance, make one part 6 price chromium is reductive for tervalent chromium. If tervalent in use process chromium has increased a long time, contrary, undertake electrify is handled below the circumstance in cathode of big in relief minimum namely. ② often determines the density of solution, add water in time or heat condense solution. Solution is medium phosphoric acid, vitriolic answer with the content of chromic anhydride and tervalent chromium period analysis and adjust. ③ uses the as a result of zincous and deliquescent iron content in the process to lift gradually, the content when iron (calculate by Fe2 03) the part when achieving 8 ％ of 7 ％ ～ changes, or change entirely solution. ④ is made up first will phosphoric acid and vitriolic mix, chromic anhydride is deliquescent at water, pour acerbity mixed liquor next 8 0"C heats in aqueous solution of person chromic anhydride. Join isinglass slowly below ceaseless agitate (reaction is right now intense) . After reaction ends (about after 1 H) solution turns into even grass green. Of other metal electroanalysis of polishing copper and its alloy electroanalysis polishing, use phosphoric acid electrolyte extensively. Of aluminium and aluminium alloy electroanalysis polishing uses phosphoric acid one vitriolic the solution with one acidity chromium. Of aluminium and aluminium alloy electroanalysis polishing applies more extensively on production. The spare parts after polishing if the oxidation processing that immediately has short time, the exterior that can get level off light not only still can form complete oxidation film, rise be able to bear or endure corrode sex, can maintain its surface burnish for a long time. Of solution make up a method, can consult steely spare parts electroanalysises the concerned content of polishing. When the aluminous content in solution exceeds 5 ％ , should change partly or change entirely solution. When chloric ionic content exceeds 1 ％ , spare parts surface allows spot corrosion of easy occurrence spot. In making up the water that solution uses chloric ionic content should little at L of ／ of 8 0 Mg. 2, it is right in specific solution that chemistry casts actinic polish the spare parts undertakes dip corrode does smooth process. Chemical polish equipment is simple, can handle appearance to compare complex part. The quality of polish of defect sufficient chemistry is inferior to electroanalysising polishing. The adjustment of solution and second birth are more difficult also, be restricted on application. Especially the nitric acid in chemical polish unit process of cargo bandling sends out a many Huang Zong is lubricious harmful gas, very serious to environmental pollution. CNC Milling