New technology of diamond plating pre-treatment

The summary offerred the new technology of diamond of the one plating that cover report. Change a skin through using mechanical and abrade deoxygenate, join alkaline additive, zincous processing and electrochemistry to remove oily means, improved the exterior condition of matrix greatly. This craft strengthened plating pre-treatment, solved the problem with film bad adhesion, raised plating film quality and service life. The keyword eletroplates diamond of new technology of plating pre-treatment of TG7061 of 　 of date of classification of plating pre-treatment diamond is the hardness that discovers at present highest, sharp sex is better wear bead. Use eletroplating method to expect King Kong stone mill " eletroplate " go up in metallic matrix, replace method of traditional Die Casting agglomeration, invest little, cost not only low, and the combustion that avoided to issue diamond in high temperature circumstance, assured the hardness of diamond and sharp sex. In whole report in plating diamond process, the electric film union of 90% above is undesirable because plating pre-treatment is undesirable,be be caused by. Accordingly, should rise eletroplate quality, the mainest is to do good plating pre-treatment. The content of plating pre-treatment includes roughly: Clean except corrode of oily, antirust, dip, pickling, activation and add auxiliary electrode and outfit to hang etc. To improve film quality, eletroplate domestic and internationally through be opposite trade situation undertakes analyse and be comparatived, couple is real, made plating pre-treatment new technological process be as follows: Go burr → cleans → to besmear insulation glue → swabs heat of → alkaline degreasing → , cold water to rinse cold water of → pickling → to rinse → electrochemistry to rinse → positive pole to handle → to rinse groove except oily → . 1.

Go the burr eliminate that burr uses sand paper and hand file to attend work, prevent workpiece surface to present the bad position of interpose report. 2.

Clean swab workpiece with alcohol, of surface of preliminary and cleared workpiece smeary. 3.

The workpiece after besmearing insulation glue will be swabbed, besmear on the place that be not plating a fast adhesive, make the place that be not plating is isolated from. 4.

Swab be gone up to be isolated from by besmear to prevent to want plating place glue, the file that use a hand or sand paper this place again burnish, rinse next. 5.

If the watch is shown 1 times,alkaline degreasing divides fat dose recipe. Express recipe of the 1 agent that remove oil to express content of drug name norms / G.

C of L-1 sodium carbonate.

P55 oxyhydrogen changes sodium C.

C of P10 siliceous natrium.

12 alkyl of P6 are vitriolic sodium C.

Natrium of P1 hydrogen oxidation has very powerful saponification effect, with move vegetable oil to react, generate solubility flying black and glycerine. 12 alkyl are vitriolic sodium is a kind of surface breathes out alive agent, in its group and vitriolic root kiss 12 alkyl hydrophobic group water radical cooperates with roundly to should fall, reduced the exterior pulling force between liquid and job. It regards a kind of lye as additive, accelerated the rate that remove oil. Sodium carbonate and siliceous natrium are two kinds of buffer come to be in action of the amortize since acid, make the PH value of fluid of be in harmony basically maintains not edge. workpiece buy and in afore-mentioned solution, in 40 ℃ ～ the circumstance of 60 ℃ falls clean 30 minutes or so. 6.

Hot, cold water is rinsed rinse with hot water first, using cold book to rinse, in avoiding to enter acerbity solution except oily fluid. 7.

Pickling pickle recipe sees the watch is shown 2 times, its purpose is the oxidation skin of purify matrix surface. Express 2 pickle recipe to express C of hydrochloric acid of content of drug name norms.

P1:1(Bulk is compared) 　 8.

After cold water rinses pickling, work clip gives, rinse with cold water, install next hang electrochemistry to divide oil groove inside. 9.

Electric flower learns to divide fat dose recipe to see a table except oily electrochemistry 3 watches 3 electrochemistry divide content of norms of name of fat dose drug / G.

L-1 oxyhydrogen changes sodium C.

C of P16 sodium carbonate.

C of natrium of P40 phosphoric acid.

P16 　 hangs working outfit inside this solution, receive with point source, first shade class handles 1 minute, next zincous processing is planted 3 minutes. Uses current density is 10A/dm2, electrode is stainless steel board. Electrochemistry is as follows except oily reaction: Positive step removes oil: 4OH- - 2e=O2 ↑ + H2O cathode removes oil: 2H++2e=H2 ↑ 　 is used first the be disgusted with after shade extremely eliminate oily doctrine jointly, have go oily rate is rapid, without the advantage with clear hydrogen. 10.

Rinse the work that will divide oil hind with electrochemistry to enter a gender to rush all right with the book fine wash, preparation goes unexpectedly processing of in relief travel. 11.

Zincous processing positive pole handles fluid recipe to see the watch is shown 4 times, hung up matrix outfit, in needing plating place to insert this fluid. Negative pole uses leading, positive electrode uses matrix. Current density is 25A/dm2, weld time is 3 minutes. Positive step processing avoided to produce the phenomenon with fragile hydrogen, agree with especially last working procedure before entering groove. Express 4 positive pole to handle fluid recipe to express content of drug name norms / G. L-1 is vitriolic (specific gravity C.

P2: 3 (bulk is compared) 　 12.

After rinsing the matrix that ends zincous processing into groove to undertake rinsing quickly, put eletroplate in groove, preparation eletroplates. So far, the whole plating pre-treatment that the diamond that finish eletroplates. Experiment of 2 tests result divides test specimen 5 groups, plating pre-treatment undertakes below different plating pre-treatment technological process, be in next same eletroplate eletroplate into groove below the condition. Specific processing condition sees each groups of test specimen the watch is shown 5 times. Express 5 plating pre-treatment condition and measure result flow group to fasten Ⅴ of Ⅳ of Ⅰ Ⅱ Ⅲ to swab / / / / / pickling / / / / alkaline degreasing / / / electrochemistry removes oil / / zincous processing / examine adhesion brittleness is unqualified unqualified eligible qualification is eligible / / 2 30o4. When the experiment, temperature is 40 ℃ ± 1 ℃ , current density is 40MA/dm2, the 2 nickel with very pure this world board, cathode is test specimen. The test specimen that is over to eletroplating undertakes adhesion and brittleness of two respects examine. Film adhesion examines is to use qualitative experiment to detect method namely file trial law. Law of alleged file experiment is to show to film by matrix with the file direction becomes edge of 45o file film. Be not taken like film or fall off, it is qualification. When adhesion is good, the brittleness that has film again examines. Brittleness examines those who use is to curve a law. Curve a law to place test specimen in the reverse bending on vice, the change that curves place with magnifier observation at the same time comes appear till the first crackle. By the watch the measurement of 5 the result is knowable, use new technology, test specimen surface is bright and clean the gender is good, smeary be divided with oxidation skin clean, test specimen presents a good position sufferring plating. The adhesion between film metal and base metal is good, the uniformity of film, integrality is better. 3 conclusion 　 1.

Use machinery to go the method that burr, rasp wants plating place, prevent workpiece surface to present the bad position of interpose report; 2.

12 alkyl vitriolic natrium serves as alkaline additive, strengthened the active of matrix surface, go oily speed fast, quality is good; 3.

Use microtherm to go oily, make matrix does not suffer thermal stress to affect; 4.

After alkaline degreasing and pickling, use electrochemistry to divide oil and zincous processing again, changed the position of matrix surface greatly, enhanced the dispersive ability of plating fluid and covering power, raised the uniformity of film, integrality, enhanced the adhesion of film. CNC Milling