Tin-zinc alloy plating device and technology with barrel plating bath
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A technology for alloy electroplating and barrel plating tanks, which is applied in the direction of plating tanks, electrodes, and electrolytic processes, and can solve the problems of reduced corrosion resistance of alloy electroplating layers, imbalance of tin and zinc ion ratios, and uneven content of tin-zinc alloys, etc., to achieve Good gloss, stable content ratio, corrosion resistance and good welding performance
Inactive Publication Date: 2016-11-16
厦门同恒金属有限公司
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[0002] At present, the tin-zinc alloy coating can be prepared by various methods, such as hot-dip plating process, vacuum plating process, etc., but these processes have their own defects, while the tin-zinc alloy plating process in barrel plating tanks is widely used and has a bright future. Good; in the zinc-tin alloy electroplating process, whether the content of divalent tin in the plating solution is stable will affect the tin content of the tin layer of the workpiece. Theoretically, the current efficiency of the anode is 100%, while the current efficiency of the cathode is 35-65%. The tin-zinc alloy electroplating process adopts single anode electroplating. During the electroplating process, the tin content in the plating solution gradually increases, resulting in an imbalance in the ratio of tin and zinc ions in the plating solution. After electroplating, the tin-zinc alloy content in the electroplating layer is uneven or exceeds The alloy ratio required by the alloy coating leads to a great reduction in the corrosion resistance of the alloy coating
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Embodiment 1
[0044] After the workpiece is pretreated, the electroplating treatment is carried out under the following plating bath conditions:
[0045] pH: 6.2;
[0046] Divalent tin: 0.8g / L;
[0047] Divalent zinc: 15g / L;
[0048] Tin-zinc anode current: 120A;
[0049] Graphite anode current: 21.3A;
[0050] The temperature of the plating bath is 18°C;
[0051] The cathode current density is 0.5A / dm 2 .
Embodiment 2
[0053] After the workpiece is pretreated, the electroplating treatment is carried out under the following plating bath conditions:
[0054] pH: 6.5;
[0055] Divalent tin: 1.2g / L;
[0056] Divalent zinc: 18g / L;
[0057] Tin-zinc anode current: 135A;
[0058] Graphite anode current: 48.3A;
[0059] The temperature of the plating bath is 22°C;
[0060] The cathode current density is 0.65A / dm 2 .
Embodiment 3
[0062] After the workpiece is pretreated, the electroplating treatment is carried out under the following plating bath conditions:
[0063] pH: 7.0;
[0064] Divalent tin: 1.5g / L;
[0065] Divalent zinc: 22g / L;
[0066] Tin-zinc anode current: 160A;
[0067] Graphite anode current: 66A;
[0068] The temperature of the plating bath is 24°C;
[0069] The cathode current density is 0.8A / dm 2 .
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Abstract
The invention discloses a tin-zinc alloy plating device and technology with a barrel plating bath. The device comprises the plating bath, a rolling barrel, at least two power rectifiers, anode assemblies electrically connected to positive electrodes of the power rectifiers and cathode work-pieces connected to negative electrodes of the power rectifiers, wherein the anode assemblies and the cathode work-pieces are oppositely arranged inside the plating bath; each anode assembly comprises at least one soluble anode and at least one insoluble anode; and the soluble anodes are composed of one or two kinds of tin sheets and tin-zinc plates. According to the plating device and technology, the tin content in plating layers can be effectively controlled to be 70+/-12%, crystals are fine, the tin-zinc alloy content proportion is stable after work-pieces are plated, the corrosion resistance and the welding performance are good, and the electric conductivity and the electrical resistance are low.
Description
technical field [0001] The invention relates to the field of electroplating, in particular to a tin-zinc alloy electroplating device and process for a barrel plating tank. Background technique [0002] At present, the tin-zinc alloy coating can be prepared by various methods, such as hot-dip plating process, vacuum plating process, etc., but these processes have their own defects, while the tin-zinc alloy plating process in barrel plating tanks is widely used and has a bright future. Good; in the zinc-tin alloy electroplating process, whether the content of divalent tin in the plating solution is stable will affect the tin content of the tin layer of the workpiece. Theoretically, the current efficiency of the anode is 100%, while the current efficiency of the cathode is 35-65%. The tin-zinc alloy electroplating process adopts single anode electroplating. During the electroplating process, the tin content in the plating solution gradually increases, resulting in an imbalance ...
Claims
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