Surface phosphating treatment technology

Skim to the water - cleaning -> watch - phosphating, washing and drying. Phosphating film quality evaluation project and the method 1, corrosion performance measurement is the most commonly used copper sulfate intravenous drip experiment method. Now and after the procedure to salt fog test, according to the needs of users and heat-resistant thermal test or cycle test, etc. 2, thickness ( Or weight method) Determination method for steel plate phosphating film is phosphide plate immersed in 75 degrees, the mass fraction of feed % in chromic acid solution ( 10 ~ 15) To remove in phosphating film, and then remove the film before and after the difference of the weight of the membrane. 3, microstructure of microscopy in order to amplify the phosphating film metallographic microscope or electronic microscope to 100 ~ 1000 times, observe the crystal shape, size and condition. Crystal shape columnar crystal as well. Smaller crystal size as well, generally control the following a few dozen microns, rows of more uniform, porosity as small as possible. 4, good visual method phosphating film appearance appearance even complete close, without metal window and lime. Zinc phosphating film for grey film, iron series phosphating is rainbow color film. For aluminium and aluminium alloy is colorless or color aluminum skin membrane. 5, determination of secondary adhesion after phosphating film coating adhesion to a adhesion. Under certain conditions in water after the determination of adhesion of heat-resistant called secondary adhesion. Is generally after the water resistant test model with grid method for the determination of adhesion, tape stripping observation after coating fall off grade, generally are parallel comparison experiment. 6, impact resistant test is often together after coating, with 49 N & # 8226; Cm to coating after phosphating board during impact test, after the shock impact point is not the opposite of the example of radioactive cracks, can determine the quality of the phosphating film is good surface phosphating treatment method of copper and copper alloy [appearance disposal measures to To 1) In the following solution to 25 30 ° C impregnating 1 min; Sulfuric acid and nitric acid water 17 and then washed, 25-50 Boring under 60 ° C. ( Measure 2] In the following solution to 60 70 ° C impregnating 10 min: 40 ferric sulfate 4 concentrated sulfuric acid. Five water 38 then washed, at 60 Boring under 70 ° C. ( Measure 3] Skim commonly used solvents, trichloroethylene, butanone, ethyl acetate. ( Method 4] After sand blasting or emery cloth polishing coarsening skim. ( Measure 5] In the following 25 - in the solution Dip under 30 ° C - 1 2分钟:[ Measure 6] In the following solution to 25 10-30 ° C under dipping 15 min: sulfuric acid sodium dichromate 10 5 85 water washed, dry at room temperature. 15 nitric acid ferric trichloride 30 200 and then water washed, dry at room temperature. ( Method 7] In the following solution oxidation: potassium persulfate 1. 5 caustic soda water at 60-100 Dipping 15-70 ° C 20 min, appearance is in black, swab with carbon tetrachloride once before cementing. This method is used for copper foil. ( Method 8] In the following 10 min etching in the solution after degreasing, temperature is 66 - 71 ° C: ferric sulfate. 4. Sulfuric acid May 3. 4 450 water at 20 ° C to wash in cold water for 5 min, and then in the following solution leaching bright: sodium dichromate sulfuric acid water 10 85 then rinse in cold water, soak in ammonium hydroxide ( d = 0。 85). 10 min, reoccupy cold water wash 5 min, distilled water rinse and dry under 40 ° C. This method used for disposal of brass and bronze.