135results about How to "Plating solution is stable" patented technology

The invention discloses a palladium-free chemical copper plating method. The method comprises the steps of firstly forming a poly-dopamine layer on the surface of a base body in a solution through the oxidation polymerization effect of dopamine, reducing silver ions to nano silver through poly-dopamine, catalyzing reduction of copper ions in chemical copper plating solutions with the nano silver serving as a catalytic center and finally forming a complete and compact metal copper layer on a surface to be plated. The method has the advantages that the operation is simple, the application range of material to be plated is wide, the requirement for equipment is low, the cost is low, coatings are firm, and the sizes of crystal grains are small.

The invention relates to chemical-copper plating liquid and a copper plating production process, which are used for copper plating of tubular steel and iron pieces and non-metal pieces, and are characterized in that: the chemical-copper plating liquid consisting of copper sulphate, a retarder, a complexant, a reductant and deionized water is used to pretreat a workpiece and then the workpiece is subjected to chemical-copper plating; an anode is 0.3 percent phosphor-containing copper plate; the area ratio of the anode and the cathode is 2:1; the current intensity in the cathode is 0.5 to 4A/dm<2>; the pH value of the copper plating liquid is 1.0 to 3.0; the temperature of the copper plating liquid is normal temperature; and the carrying capacity is 1 to 4dm<2>/kg; the copper plating time is8 to 10 minutes. The liquid and the process have the advantages of firm bonding between cladding and a substrate, stable process, high impurity resistance, long service life, crystalline simple copper cladding, fine cladding crystallization, low porosity, high anticorrosion performance, simple operation, convenient maintenance, no formaldehyde, no damages to human bodies and environment and environmentally-friendly product.

The invention relates to multi-coordination-agent cyanide-free electrogilding liquid and an electrogilding process, which belong to the technical field of electrogilding. The electrogilding liquid is prepared from a main coordination agent, an auxiliary coordination agent, potassium hydroxide, potassium carbonate, goldpotassium chloride, combined additives and ultrapure water. The electrogilding process comprises the following steps: 1, preprocessing a substrate; 2, electroplating an intermediate nickel plating layer; 3, electrogilding, namely washing the substrate after electroplating the intermediate nickel plating layer with ultrapure water, directly feeding the substrate into a plating cell containing the multi-coordination-agent cyanide-free electrogilding liquid to be electrogilded, taking out a sample from the electrogilding liquid after the electrogilding, washing the surface of the sample by utilizing distilled water, and drying the sample through cold air. Double coordination agents are used as the coordination agents of gold ions in the electrogilding liquid, so that a cyanide-free electrogilding system which has high current efficiency, smoothness and compactness in plating layer crystallization, wide current density range, wide temperature requirement and capability of guaranteeing the golden bright appearance of the plating layer compared with those of a single coordination agent system is obtained.

The invention discloses a cyanide-free bright electrogilding additive and an application thereof, which belongs to the technical field of electrogilding. The electrogilding additive is prepared from additives and ultra-pure water, wherein the additives are organic additives or mixtures of inorganic additives and organic additives; the concentration of each component in the additive is 0.5-30g/L. The cyanide-free bright electrogilding additive disclosed by the invention has the functions of improving the brightness of a plated layer, refining crystal grains, stabilizing plating liquid and reducing surface tension. Therefore, the additive can be applied to electrogilding plating liquid, and the addition amount is 0.1-100mL/L. By adopting the additive disclosed by the invention, the properties of the plating liquid and the plating layer of a multi-coordination agent cyanide-free electrogilding system can be effectively improved, the plating liquid has no unstable situations of decomposition, precipitation and the like under long-time working condition, and an electrogilding layer which is golden and full bright macroscopically, uniform and compact in micro crystal, flat and crackless can be obtained under the electroplating condition.

This invention provides a cyanide-free silver-electroplating solution, which comprises: silver-containing organic or inorganic salt 1-200 g/L, purin coordination agent 1-800 g/L, supporting electrolyte 1-200 g/L, pH regulator 0-550 g/L, and additive system. The preparation method comprises: uniformly mixing the above components to prepare the cyanide-free silver-electroplating solution, and adjusting the temperature to 10-60 deg.C. Compared with the traditional formula, the cyanide-free silver-electroplating solution in this invention has such advantages as low or no toxicity, and high stability. Silver ions have a very low displacement rate with copper, nickel, iron, aluminum, chrome, titanium and alloy matrices. The work piece to be plated does not need preliminary silver plating or silver dipping. The silver-electroplating layer has such advantages as high adhesiveness and high shinness, and can be used in decorative and functional electroplating fields.

An electro-deposited W-base non-crystal or nano-crystal alloy electroplated layer instead of the electroplated hard Cr layer is disclosed. Its electroplating liquid contains ferrous sulfate, nickel sulfate, cobalt sulfate and sodium tungstate. Its electroplating process is also disclosed.

The invention provides novel cyanide-free silver plating electroplating liquid and an electroplating technology. The cyanide-free silver plating electroplating liquid comprises, by mass concentration, 1.5-4 g/L of silver nitrate, 2-50 g/L of potassium carbonate, 2-100 g/L of hydantoin, 0.1-100 g/L of potassium gluconate, 0.1-100 g/L of potassium malate, 0.1-150 g/L of citric acid, 0.1-280 g/L of hydantoin, 0.1-280 g/L of butynediol and 0.001-20 g/L of alkyl sulfonic acid surface active agent. The electroplating technology comprises the steps of pretreatment, washing, activating, washing, beforehand silver plating, silver plating, recycling, washing, adjusting treatment, washing, hot water washing (80 DEG C), washing and silver protective agent treatment. The novel silver plating technology has the main beneficial effects that firstly, the plating liquid is very stable and easy to control, the current efficiency of the plating liquid is high, and the dispersing capability and covering capability are good; secondly, a cyanide-free formula is adopted in the electroplating liquid, potential danger of cyanide is eliminated, and pollution to the environment is greatly reduced; and thirdly, the various properties of a plating layer are not lower than those of cyaniding silver plating, and a functional cyaniding silver plating technology can be thoroughly replaced.

The present invention discloses a chemical nickel bath that is composed of solvable nickel salt, complexing agent, buffer, pH regulator of alkali metal hydroxide, and stabilizer. The operation temperature of the bath is 50-55DEG C, and the pH value is 7.0-8.5. This invention is a mesothermal alkali chemical nickel plating process that has low energy consumption and stable bath. Furthermore, the pH value is nearly neural and not regulated by ammonia, which saves the cost and improves the work condition.

The invention relates to a co-deposition electroplating method for preparing Au-Sn alloy on an electroplating substrate and a cyanogen-free Au-Sn alloy electrolyte. The wave forms of electroplating current pulses are forward variable-amplitude pulses, namely that two different forward square wave pulses exist in one period, and the peak values and the conducting time of the electroplating current pulses respectively correspond to peak value current density and time which are required for generating Au5Sn and an Au-Sn alloy phase in a plating layer. In the electrolyte, sodium sulfite is adopted as a main complexing agent and ethylene diamine tetraacetic acid is adopted as an auxiliary complexing agent for the gold ion complexing agent, potassium pyrophosphate is used as a tin ion complexing agent, hydroquinone is used as an antioxidant, and the pH value of the electrolyte is from 8 to 9. When the method is used for preparing Au-30at.%Sn eutectic plated layer through electroplating, the plating speed reaches 13 mum/hour, the electrolyte is stable, the operation is simple, and the gold and tin content in the plated layer is easy to control. The method can be applied in microelectronics and photoelectron industry for connecting and encapsulating LED chips, connecting flip chips, forming welding pads or patterns on the surface of semiconductor devices or similar devices, etc.

The invention discloses an environmentally-friendly chemical gilding liquid. The environmentally-friendly chemical gilding liquid comprises 0.5-5g/L of non-cyanide gold salt, 5-30g/L of gold ion complexing agents, 5-20g/L of an impurity screener, 0.1-10g/L of a stabilizing agent and 15-35g/L of a pH buffering agent. The non-cyanide gold salt is sodium gold sulfide or auric-sodium chloride, a sulfite is used as the main complexing agent, and through combined action of the auxiliary complexing agent, the impurity screener and the stabilizing agent, long-term stabilization of production and storage is realized. The environmentally-friendly chemical gilding liquid does not adopt cyanides and cyanogen-containing substances, does not contain limited heavy metals such as lead and cadmium, has the characteristics of long storage life, high continuous production stability, good weldability, bright color and good corrosion resistance and weatherability, can satisfy functional electron electroplating requirements and can be used as a decorative gilding liquid.

The invention discloses a technological process of a zinc-tin alloy electroplating method and a preparation method of an electroplating liquid prepared by using the process. The technical process comprises two times of thermal degreasing, two times of washing, acid hydrolysis (cathode), washing, acid washing (30% hydrochloric acid), two times of washing, oil removing through alkaline electrolysis (anode), two times of washing, activating (5-10% hydrochloric acid), two times of washing, and electroplating; meanwhile, the quality of the electroplating liquid is improved; a plurality of electroplating additives such as a complexing agent, a brightening agent, polyglycerol, a polarization type brightening agent and a reducing agent are added in the electroplating liquid. The electroplating liquid disclosed by the invention is high in stability, can be produced for a long time but not changing plating, is quick to deposit and is strong in depositing adhesion power; when the tin content of the formed electroplating layer is about 70 percent and the tin content of the formed electroplating layer is about 30 percent, the formed plating layer achieves relatively good corrosion resistance, has the salt mist property achieving 144 hr white rust and 1000 hr red rust, and has good corrosion resistance against sulfur dioxide and good plating layer softness; the plating layer can be subjected to a bending test.

The invention provides non-preplating type cyanide-free silver-plating plating solution, which is characterized in that: the mass concentration of various compositions of the raw material dispensation of the plating solution is as follows: silver ion source materials of 1 to 200 grams per liter; coordination agent creatinine and creatinine derivatives of 1 to 800 grams per liter; supporting electrolytes of 1 to 200 grams per liter; plating solution pH regulators of 0 to 550 grams per liter; and the residual is an electroplating additive system. Compared with the prior cyanide-contained silver plating technological formula, the cyanide-free silver-plating plating solution is low in toxicity or nontoxic and has good stability; simultaneously, the displacement speed of silver ions, monometals such as copper, nickel, ferrum, aluminum, chromium, titanium and so on and alloy substrates in the plating solution is very slow; plating parts are not required to be preplated or immersed and a cladding has good binding force and is bright, thereby the application requirements in multiple fields such as decorative electroplating, functional electroplating and so on are met.

The invention discloses a process for plating copper on a special steel piece with a deep/blind hole, namely render copper. The process comprises the following steps of: chemical deoiling, washing with hot water, electrolytic deoiling, washing with hot water, washing with cold water, acid washing, secondary washing with cold water, neutralizing, washing with cold water, plating copper without cyanide, secondary washing with cold water, plating tin, secondary washing with cold water, neutralizing, washing with hot water, passivating, secondary washing with hot water, washing with hot pure water, dehydrating with alcohol, removing the residual water, drying and inspecting, wherein electroplate liquid used in the step of plating copper without cyanide has the following formula: 400 to 600ml/L of BH-580 non-cyanide alkaline copper cylinder plating bath solution, 1 to 2ml/L of BH-580 non-cyanide alkaline copper brightening agent and 7.5 to 12g/L of metal copper; and the pH value is 9.2 to 9.8. The process has the advantages of good stability of a plating liquid, simple and convenient operation, good dispersibility and good covering capability; the formed plating layer has the advantages of fine and compact crystallization, good adhesive force, stable and reliable production; and the method can effectively protect environment and the physical and psychological health of operators.

The invention discloses an all-sulfate tin electroplating additive and a plating solution thereof. The additive comprises 0.1-200 mg/L defoaming agent, 0.1-50 g/L fine crystal agent, 0.01-20 g/L leveling agent and 0.1-40 g/L antioxidant. The plating solution comprises 5-100 g/L stannous sulfate, 0.1-100 ml/L sulfuric acid, and 0.1-200 mg/L defoaming agent, 0.1-50 g/L fine crystal agent, 0.01-20 g/L leveling agent and 0.1-40 g/L antioxidant used as the additive. The additive disclosed by the invention is free of anionic, cationic and amphoteric surfactants, polyformaldehyde, polyethylene oxide, polypropylene oxide homopolymer, aldehydes, heterocyclic ring compounds, amine compounds, polyaminocarboxylic acid, sulfur amino acids and any organic solvent. The plating solution can be used for obtaining a matte plating with fine crystals and uniform coverage at the on-line speed of 0-800 m/minute.

The invention discloses a method to produce the decorated chrome plating layer in trivalence chrome electroplate liquid. The invention is to select the proper additive and control the condition in the base electrolyte containing the chromium chloride to produce the non-crystal chrome plate with smooth surface and no crack, also which is the light and anti-corrosion as same as the sexivalent chrome plating. The process is stable, the operation condition is wide and the energy cost is low; also the ability of disperse, covering and current flow effect are high than sexivalent chrome plating process. The thickness of plating chrome is 0.5-1 mu m. So the invention can instead of the sexivalent process and be used in all anticorrosion and decorated field.

The present invention provides a new non-cyanide electro cooper plating bath of EDTA system and use method thereof. In the electro copper plating bath, using disodium EDTA or dipotassium EDTA as main complexant, using copper sulfate or basic copper carbonate as main salt, using trisodium citrate, potassium citrate or potassium sodium tartrate as auxiliary complexant, using sodium nitrate or potassium nitrate as conductive salt, using sodium hydroxide or potassium hydrate as pH value regulator. The invention also provides a use method of the non-cyanide electro cooper plating bath. The invention has advantages: simple plating bath formula, easy control and operation, wide temperature range of plating bath using, high current efficiency, fine crystallization coating, good appearance color, stable plating bath, strong uniform plating and covering ability, low cost, easy wastewater treatment. The invention can be used for pre copper plating or direct electro-coppering instead of virulent cyaniding electro-coppering process.

The invention relates to cyanogen-free Au-Sn alloy electroplating liquid, which belongs to the field of electroplating. The cyanogen-free Au-Sn alloy electroplating liquid comprises following components including non-cyanogen soluble monovalence gold salt, sulfite, organic polybasic acid, soluble divalent tin salt, pyrophosphate, a tin ion oxidation inhibitor, dihydric phosphate and cobalt salt. The electroplating liquid is stable, electroplating speed is fast, operation is simple, Au-Sn alloy ingredients are easy to be controlled, and the cyanogen-free Au-Sn alloy electroplating liquid is applicable to production.

The invention provides a galvanized iron (vanadium) alloy process of an acid system, belonging to the technical field of electrodeposited protective alloy coatings. An additive in the galvanized iron (vanadium) alloy process comprises a brightening agent and a complexing agent, wherein the brightening agent comprises a main brightening agent, a carrier brightening agent, an auxiliary brightening agent and a complexing agent. On a basis of original potassium chloride galvanized base fluid, the galvanized iron (vanadium) alloy process selects a suitable additive and suitable process conditions so as to surely form a Zn-Fe (V) alloy nano coating with favorable performance, wherein the coating contains 0.2-0.7 percent of iron and approximate 0.01 percent of vanadium. The additive provided by the invention has reasonable and advanced prescription, simple and reasonable preparation method, little environmental pollution, bright and smooth product surface, good quality stability and corrosion resistance, low production cost and simple process.

The invention discloses a cyanide-free electroplating bath for the copper plating of iron and steel parts. The electroplating bath provided by the invention comprises copper sulphate, potassium carbonate, one or more than two of organic phosphate and phytic acid, and one or more than two of sodium citrate, seignette salt and potassium thiocyanate. The electroplating bath provided by the invention is applied to the copper plating of the iron and steel parts, and has the advantages of fine and compact coating crystals, dispersing power and covering power both superior to those of cyaniding copper-plating solution, simple components, stability, no decomposition products, no need of heating, reduction in energy consumption and a strong binding force between a coating and a substrate.