Desmutting powder for plating zinc and zinc alloy and aluminum and aluminum alloy and preparation method thereof
A technology of aluminum alloy and zinc alloy, which is applied in the field of galvanized and zinc alloy, aluminum and aluminum alloy light-emitting powder and its preparation, can solve the problems of large consumption, poor workpiece, environmental and health hazards, and increase the use of Effects of life, reduction of thickness variation, and reduction of microetch variation
Pending Publication Date: 2021-08-10
深圳市高新昌科技有限责任公司
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Problems solved by technology
[0002] At present, nitric acid is used for surface treatment of zinc and zinc alloys, and different concentrations of nitric acid are used according to various needs. The consumption is large, and the concentrated acid-removing liquid and steam are highly corrosive, and the problem of smoke also causes environmental and health hazards.
[0003] Nitric acid is highly corrosive to zinc and zinc alloys, and it is difficult to control the micro-corrosion rate of zinc and zinc alloys. Especially, the workpieces in the electroplating process have high and low current regions, which makes the process less stable and thinner parts are prone to excessive micro-etching cause defective workpieces
Method used
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specific Embodiment 1
[0023] Specific embodiment 1: be used for galvanized and zinc alloy and aluminum and aluminum alloy light emitting powder, comprise the composition composition of following percentage by weight: sodium nitrate 50%, sodium fluoride 10%, citric acid 20%, methanesulfonic acid 20% %.
specific Embodiment 2
[0024] Specific embodiment 2: be used for galvanized and zinc alloy and aluminum and aluminum alloy light emitting powder, comprise the composition composition of following percentage by weight: sodium nitrate 60%, sodium fluoride 8%, citric acid 12%, sulfamic acid 20% .
specific Embodiment 3
[0025] Specific embodiment 3: be used for galvanized and zinc alloy and aluminum and aluminum alloy light emitting powder, comprise the composition composition of following percentage by weight: sodium nitrate 70%, sodium fluoride 5%, oxalic acid 10%, methanesulfonic acid 15% .
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The invention relates to the field of metal surface treatment processes, in particular to desmutting powder for plating zinc and zinc alloy and aluminum and aluminum alloy and a preparation method thereof. According to the desmutting powder for plating zinc and zinc alloy and aluminum and aluminum alloy and the preparation method thereof, the formula of a desmutting agent is powder, no liquid acid is used, and the problems of high corrosivity and fuming are solved; dry acid salt is used for replacing nitric acid, and the dry acid salt is composed of sodium nitrate, sodium fluoride, sulfamic acid and citric acid; the organic acid provides hydrogen ions, the acidity in the liquid medicine is reduced to meet the requirement of desmutting, and other substances are buffer substances, have the function of stabilizing the liquid medicine and reduce the micro-etching difference of high and low current regions; and the buffering agent exists in the formula, so that the thickness difference of zinc and zinc alloy on a workpiece and the thickness difference of aluminum and aluminum alloy on the workpiece due to micro-etching desmutting can be reduced, the surface of the workpiece is smoother and finer, the treatment amount of acid exhaust can be reduced, and the desmutting powder is nontoxic and harmless compared with liquid acid in the production process.
Description
technical field [0001] The invention relates to the field of metal surface treatment technology, in particular to a light-extracting powder used for galvanizing, zinc alloy, aluminum and aluminum alloy and a preparation method thereof. Background technique [0002] At present, nitric acid is used for surface treatment of zinc and zinc alloys. Different concentrations of nitric acid are used according to various needs. The consumption is large, and the concentrated acid-removing liquid and steam are highly corrosive. The problem of smoke also causes environmental and health hazards. [0003] Nitric acid is highly corrosive to zinc and zinc alloys, and it is difficult to control the micro-corrosion rate of zinc and zinc alloys. Especially, the workpieces in the electroplating process have high and low current regions, which makes the process less stable and thinner parts are prone to excessive micro-etching Cause defective workpieces. Contents of the invention [0004] In o...
Claims
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IPC IPC(8): C23F3/02C23F3/04C23F1/10
CPCC23F3/02C23F3/04C23F1/10
Inventor詹吉隆
Owner深圳市高新昌科技有限责任公司