| abstract |
The present invention provides a kind of preparation methods for having cated hard alloy piece, before hard alloy cutter substrate deposit coating, it is handled first using the pretreatment fluid containing the potassium ferricyanide, highly basic, water, the pretreatment fluid can be effectively to remove the obstinate pollutant such as the oil stain of matrix surface, oxide layer, foreign ion, increase the microscopic asperity of matrix skin, the film substrate bond strength of coating is helped to improve, avoids using expensive sandblasting machine equipment, has saved production cost. |