diamond electroplated tools of new technology

Diamond is found in the highest hardness, sharp with good abrasive. The method

of electroplating diamond abrasive "plating out" on the metal base, instead of

the  diamond saw blade  traditional casting sintering, not less investment, low cost, and avoid the

oxidation of the  diamond under high temperature conditions, to ensure the

hardness and sharpness of diamond.
Diamond in the whole process, the plating layer with more than 90% is due to

poor due to poor plating pre-treatment. Therefore, to improve plating quality,

the most important thing is to do pre-plated.
Pre-treatment of the general content include: degreasing, rust, etching,

pickling, cleaning and activation plus auxiliary electrode and fitted pegs.
In order to improve the coating quality, after the electroplating industry at

home and abroad were analyzed and compared with the actual, developed a new

treatment before plating process is as follows: deburring cleaning coating

thermal insulating plastic scrub chemical degreasing, pickling cold water cold

water electricity Chemical degreasing washing anodized flushed into the slot.
1 with sandpaper and hand deburring file to remove burrs on the workpiece, to

prevent the workpiece surface showing dielectric bad state.
(2) The workpiece cleaning with alcohol scrub again, initially cleared the

surface of the oil.
3 plastic insulation coating the  masonry saw blades  workpiece after the scrub, in the non-plated

parts coated with a layer rapid adhesive coated parts of the non-insulated.
4 To prevent the need to scrub plated parts are coated with plastic insulation,

hand file or sandpaper to polish the parts and then again, and then rinse.
5. Chemical degreasing degreasing formulations.
Sodium hydroxide has a strong saponification, and animal and vegetable oils

reacts fly soluble soap and glycerin. THF is a surface active agent call in its

hydrophobic group and a dodecyl sulfate synergy hydrophilic groups should,

lowering the liquid and the surface tension between the work. It acts as a

caustic additive accelerated degreasing speed. Sodium carbonate and sodium

silicate to place relative to the two buffer from the buffer to the acid, the

PH value of the melt remain substantially edges. The workpiece is set with the

above solution at 40 ℃ ~ 60 ℃ case of cleaning for about 30 minutes.
6 hot, cold rinse first with hot water, rinse with cold book, to avoid oil into

the acid solution in addition.
7 pickling acid liquid formulation, its purpose is to remove the oxide surface

of the substrate.
8 cold water after pickling, the workpiece clip out, rinse with cold water, and

then loaded linked to the electrochemical degreasing tank.
9 spark electrochemical degreasing degreasing formulations school
The work clothes hanging in the cbn grinding wheels  solution, the connection with the point source,

the first cathode for 1 minute, 3 minutes and then anodized. The current

density used 10A/dm2, an electrode of stainless steel plate. Degreasing

electrochemical reactions are as follows:
Anode degreasing: 4OH - 2e = O2 + H2O
Cathodic degreasing: 2H + +2 e = H2
Very tired after using the first female co-degreasing method, with degreasing

speed, no hydrogen embrittlement advantages.
10 Rinse the workpiece after electrochemical degreasing sexual activity with a

book rushed into thin wash, prepare hast yang line processing.
11 anodized
Anodizing liquid formulations shown in Table 4, the substrate is mounted hung,

to be inserted into the fluid-plated parts. A negative electrode lead, the

positive electrode substrate. Current density of 25A/dm2, is applied for 3

minutes. Anodized avoid hydrogen embrittlement phenomenon, especially for the

last one into the groove before the procedure.
12. Rinsed into the slot of the anode substrate processed quickly rinsed, into

the plating tank, ready to plating.
This completes the entire diamond plating plating pre-treatment.
(Two) results
The specimen divided into five experimental groups, at various pre-plating

process under the pre-plating, and electroplating in the same plating

conditions into the slot. Specimens of each group specific treatment

conditions.
Specimen using 15152mm2 iron tablets. Experiment, the temperature was 40 ℃ 1

℃, the current density is 40MA/dm2, the anode 2 is pure nickel plate, cathode

specimen.
After the plating adhesion test pieces for both test and brittleness. Coating

adhesion test is a qualitative assay method using the rasp test. The so-called

experimental method refers rasp rasp coating from the substrate to the coating

direction 45o filing edges. If coating is not to be brought up or fall off, was

qualified.
When the binding is good, then the coating brittleness test. Brittle bending

test is used. Bending the specimen caught in the vise repeated bending, but

with a magnifying glass to observe the changes appear curved parts of the first

crack so far.
Table 5 shows the measurement results, the use of new technology, the specimen

surface smooth and good, grease and oxide are Ex, specimen showing a good state

by plating. Coating metal and the substrate has good adhesion between the

metal, coating uniformity, are better integrity.
(Three) Conclusion
1 mechanical deburring, rasp-plated parts required methods to prevent the

workpiece surface showing the bad state of the dielectric;
(2) the sodium dodecyl sulfate as a base additive to enhance the activity of

the matrix surface, to the oil rate, good quality;
3 using low temperature to the oil, so that the substrate from heat stress;
4, after the chemical degreasing and pickling, and by electrochemical

degreasing and anodizing, greatly changed the state of the substrate surface to

improve the dispersibility of the bath and covering ability to improve the

uniformity of the coating, integrity enhance the coating adhesion.