The diamond is the highest hardness and sharpness. Will adopt the method of electroplating diamond abrasive "plating" on the metal substrate, instead of the traditional die casting sintering process, less investment, low cost, not only avoided under the condition of high temperature and oxidation of the diamond, guarantee the hardness of diamond and sharp.
In the process of electroplated diamond, more than 90% of the electroplating layer is bad due to the bad treatment. Therefore, to improve the electroplating quality, the most important is to do the pre-plating treatment.
The pretreatment contents include: oil removal, rust prevention, etching, pickling, activation cleaning, auxiliary electrode and mounting etc.
In order to improve the quality of coating, through analysis of electroplating industry situation at home and abroad and the comparison, combining with practice, formulated the new technology of plating pretreatment process is as follows: the insulation glue deburring cleaning swab chemical degreasing hot and cold water flushing pickling electrochemical anodizing oil removal rinse wash cold water into the tank.
1. Remove the burr on the workpiece by using sandpaper and hand file to prevent the surface of the workpiece from showing the bad state of dielectric.
2. Clean the workpiece with alcohol to clean the surface of the workpiece.
3. Apply insulating glue to the workpiece after scrubbing, and apply a quick adhesive to the non-plated parts to insulate the non-plated parts.
4. Scrub in order to prevent the coating from being coated with insulating glue, then rub the area again with a hand file or sandpaper, and then rinse.
5. The manufacturer of diamond cutter introduces chemical deoiler formula.
Sodium hydroxide has a strong saponification effect and reacts with animal and vegetable oil to produce soluble fly soap and glycerin. Sodium dodecyl sulfate is a kind of surfactant, which reduces the surface tension between the liquid and the work under the coordination of its dodecyl hydrophobic group and hydrophilic hydrophilic group. It is used as a lye additive to accelerate the oil removal rate. Sodium bicarbonate and sodium silicate are two kinds of buffer to buffer the acid, so that the PH value of the melt is basically not side. The workpiece and in the above solution, in the case of 40 ℃ ~ 60 ℃ cleaning for 30 minutes.
6. Heat, rinse with hot water first, rinse with cold book, and avoid removing oil into acid solution.
7. The formulation of pickling acid lotion is designed to remove the oxide skin on the surface of the substrate.
8. After rinsing the acid in cold water, remove the workpiece and wash it in cold water, then put it in the electrochemical degreasing tank.
9. Electrochemical degreasing and electrochemical deoiler formulation.
Hang the work load in this solution, connect to the point source, and then process the anode for 1 minute, then anodize 3. The current density is 10A/dm2, which is extremely stainless steel plate. The electrochemical deoil reaction is as follows:
Yang class oil removal: 4OH--2e=O2+H2O.
Cathode degreasing: 2H++2e=H2.
The method of combined oil removal with the first Yin is the advantage of fast oil removal and no hydrogen embrittlement.
10. Rinse and wash the workpiece after using electrochemical deoil, and prepare to handle it in line.
11. Anodic treatment
The formula of anodic treatment solution is shown in table 4, and the substrate is mounted and the plating part is inserted into the liquid. The negative electrode is made of lead plate and the anode is used in the matrix. The current density is 25A/dm2 and the power supply time is 3 minutes. It avoids the phenomenon of hydrogen embrittlement and is especially suitable for the last working procedure before entering the slot.
12. Flush into the tank to flush the substrate after the anode is processed, and put it in the plating bath to prepare the plating.
