Preparation method and electroplating method of normal-temperature environment-friendly sulfate trivalent chromium electroplating liquid
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An environment-friendly, sulfate-based technology, which is applied in the field of electroplating solution and electroplating technology, can solve the problems of poor corrosion resistance of the plating layer, many components of the plating solution, and low deposition rate, etc. Effect
Inactive Publication Date: 2010-08-04
HARBIN INST OF TECH
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[0003] The technical problem to be solved by the present invention is to provide a normal temperature environment-friendly sulfate trivalent Chromium electroplating solution preparation method and electroplating method
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specific Embodiment 1
[0009] Specific embodiment one: in the present embodiment, the normal temperature environment-friendly sulfate trivalent chromium electroplating solution is made up of main salt, complexing stabilizer, combined additive, buffer and conductive salt, wherein in the normal temperature environment-friendly sulfate trivalent chromium electroplating solution The content of main salt is 10g / L~100g / L, the content of complexing stabilizer is 5g / L~120g / L, the content of combined additive is 0.05g / L~6g / L, and the content of buffering agent is 20g / L~90g / L L, the conductive salt content is 80g / L~200g / L.
specific Embodiment 2
[0010] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the main salt is chromium sulfate or potassium chromium sulfate. Others are the same as in the first embodiment.
specific Embodiment 3
[0011] Specific embodiment three: what this embodiment differs from specific embodiment one or two is that described complexing stabilizer is formic acid, sodium formate, potassium formate, ammonium formate, acetic acid, sodium acetate, potassium acetate, lactic acid, sodium lactate, Potassium lactate, glycolic acid, sodium glycolate, potassium glycolate, ammonium glycolate, oxalic acid, sodium oxalate, potassium oxalate, ammonium oxalate, tartaric acid, sodium tartrate, potassium tartrate, potassium sodium tartrate, citric acid, sodium citrate, citric acid Two or three of potassium, ammonium citrate, glycine, ascorbic acid, methanol, sodium sulfite and sodium hypophosphite. Others are the same as one of the specific embodiments one or two.
[0012] The complex stabilizer described in this embodiment is composed of each component in any ratio.
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Abstract
The invention provides a preparation method and an electroplating method of normal-temperature environment-friendly sulfate trivalent chromium electroplating liquid, which relates to electroplating liquid and electroplating technology. The invention solves the problems of poor stability of the traditional trivalent chromium electroplating liquid, low precipitating and depositing rate of harmful gas in an electroplating process, more components of the electroplating liquid, sensitivity for impurities, poor corrosion resistance of an electroplating layer, and the like. The normal-temperature environment-friendly sulfate trivalent chromium electroplating liquid mainly comprises the following components of main salt, a complexation stabilizing agent, a combined additive, a buffering agent and a conducting salt. The electroplating liquid can work at normal temperature, thereby saving energy resources and having simple technology and high deposition rate, wherein the deposition rate can reach above 0.22micron.min<-1> under 6A / dm<2>. An anode of the invention is a Ti-based rare-metal tantalum-iridium-titanium anode, the anode oxygen-evolution overpotential is low, and harmful hexavalent chrome can not be generated. The normal-temperature environment-friendly sulfate trivalent chromium electroplating liquid has good corrosion resistance and high stability.
Description
technical field [0001] The invention relates to an electroplating solution and an electroplating process. Background technique [0002] Traditional electroplating uses hexavalent chromium electroplating, but it has the disadvantages of high toxicity, poor dispersion and coverage, low current efficiency, and the electroplating process cannot be powered off. With the continuous enhancement of people's awareness of environmental protection, the hexavalent chromium decorative electroplating process is gradually being replaced by trivalent chromium electroplating. The trivalent chromium electroplating process is divided into chloride system, sulfate system and a mixed system of the two according to the main salt type. The chloride system has the advantages of low anode cost and high deposition rate, but the coating contains a lot of trace iron, resulting in a dark coating and poor corrosion resistance, and chlorine gas is released from the anode during the electroplating process...
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