33results about How to "High bath stability" patented technology

In the invention, the sodium hypopphosphite is as the reducing agent of the bath, nickel sulfate as the main salt, with the complexing agent, accelerating agent and stabilizing agent being added. Theultrasonic chemical plating is adopted that utilizes the mechanical energy of the ultrasonic vibration, making the bath deposit nickel and phosphor under the catalysis of the metal surface and the chemical reduction method controlled. The plating procedure includes the steps of oil removal, rust removal, activation, chemical plating and post treatment. The multiple complexing, accelerating and stabilizing agents raises the stability of the bath. The plating speed is adjustable. The even, compact nickel and phosphor plating layer covers the surface of the base body of powder metallurgical material so as to increase the service life of the material and provide wide application area.

The invention discloses an alkaline non-cyanide zinc plating nickel alloy plating solution and an electroplating process thereof. The plating solution is prepared with hydantoin or a hydantoin derivative as a main coordination agent by adding an auxiliary coordination agent, zinc sulfate, nickel sulfate, potassium carbonate and water. The plating solution comprises 20 g-400 g/L of the main coordination agent, 5 g-300 g/L of the auxiliary coordination agent, 5 g-200 g/L of the zinc sulfate, 1 g-150 g/L of the nickel sulfate and 5 g-435 g/L of the potassium carbonate. The electroplating process of the plating solution comprises the steps of substrate pretreatment and zinc-nickel alloy electroplating. A constant current electroplating mode is adopted for zinc-nickel alloy electroplating. The electric current density is 0.5 A-5 A/dm2. The temperature of the plating solution is 30 DEG C-60 DEG C. The distance between a cathode and an anode is 0.5 cm-25 cm. The stirring speed of the plating solution is 0 rpm-3000 rpm. The electroplating time is 1 min-120 min. According to the plating solution and the electroplating process thereof, the hydantoin or the hydantoin derivative serves as the main coordination agent for the first time, and zinc-nickel alloy with the nickel content of 10 wt.%-13 wt.% is obtained through electro-deposition by using the main coordination agent and the auxiliary coordination agent in a combination mode. An obtained coating is good in corrosion resistance. The stability of the plating solution is improved immensely compared with using of a single coordination agent.

The invention discloses a preparation method of a Ni-SiC compound coating on the surface of an aluminum alloy. The preparation method adopts an anode type surfactant which is hexadecyl trimethyl ammonium bromide for replacing a cathode type surfactant which is lauryl sodium sulfate adopted by the invention at present. The preparation method is characterized by increasing the concentration of an anode activator NiCl2 while reducing current density and the concentration of silicon carbide in a plating solution, obtaining a fine and dense compound coating at an electroplating rate of 1-2 micron per minute, stirring by using air with volume flow being 4-7L/min and fully dispersing the silicon carbide, simultaneously adding CTAB to improve the wettability of the silicon carbide and obtain a fine and dense compound coating with high content of uniformly-dispersed silicon carbide. Through the preparation method of the Ni-SiC compound coating on the surface of the aluminum alloy, the technical problem of low tensile performance and low abrasion resistance of the aluminum alloy can be solved; the Ni-SiC compound coating with high adhesion strength, high content of uniformly-distributed hard silicon carbide particles, high hardness and high abrasion resistance can be prepared on the surface of the aluminum alloy.

The invention relates to highly anti-corrosion chemical nickel-plating liquid. The chemical nickel-plating liquid is prepared from the following components: basic chemical nickel liquid, a wetting agent, a brightener and a stabilizer, wherein the basic chemical nickel liquid is prepared from the following components by weight: nickel sulfate, sodium hypophosphite, citric acid, lactic acid, propionic acid and sodium acetate; the wetting agent is polyethylene glycol, the brightener is 2-mercaptobenzothiazole and polyimide, and the stabilizer is one or a mixture of a 3-sulfur-isothiourea propanesulfonic acid compound, 3-amino-5-mercapto-1,2,4-triazole and S-carboxyethyl isothiuronium betaine. According to the highly anti-corrosion chemical nickel-plating liquid, working temperature is 85-95 DEG C, plating speed can reach about 10-12 mu m/h, plating is even, compact, bright and good in corrosion resistance, all ordinary steel plating thickness is 10 mu m or above, and resistance to neutralsalt spray is 48 h or above.

The invention relates to a chemical plating solution and its use in low concentration standard gas packaging container which comprises, by using sodium hypophosphite as reducing agent, using nickel sulfate as the main salt as well as addition complexing agent, accelerating agent, stabilizing agent, wherein the inner surface of the container employs 5-15% H2SO4 as activating liquid, coating inert layer inside the container, conducting chemical plating and proceeding hole sealing treatment with CrO3.

The invention provides a novel chemical nickel-plating method for capacitive touch screen indium tin oxide (ITO) wiring. Compared with the conventional vacuum sputtering technology, the novel chemical nickel-plating method is low in equipment investment, low in production cost and high in efficiency; and compared with the traditional chemical nickel-plating process on a nonmetallic matrix, the novel chemical nickel-plating method has high solution stability and selectivity. The novel chemical nickel-plating method comprises the following steps of: sequentially deoiling, etching, sensitizing, activating, reducing and performing chemical nickel-plating on the ITO film glass; and the key points are that the selectivity of the ITO film is improved during sensitization by adopting sensitizing solution containing Cu+, and the sensitizing solution is more stable than the traditional Sn2+ sensitizing solution; during etching, the etching process is stabilized by employing etching solution containing S2O82- or HS2O8-, and the etching effect is improved; and the chemical nickel-plating is performed at the low temperature of 55-65 DEG C, the plating solution is stable, and the plating layer is smooth and dense. The results prove that the method is easy to operate and high in speed; the ITO surface nickel layer is completely covered and has high adhesive force, and the glass matrix is not covered by the nickel layer and has high selectivity.

The invention discloses an alkaline cyanide-free electro-deposition zinc-nickel alloy additive and an application thereof. The alkaline cyanide-free electro-deposition zinc-nickel alloy additive is prepared from an additive and ultrapure water. The additive is an organic additive or a mixture of the organic additive and an inorganic additive and can be applied to an alkaline cyanide-free electro-deposition zinc-nickel alloy plating solution to replace a traditional cadmium coating and cyanide electro-deposition zinc-nickel alloy process. According to the alkaline cyanide-free electro-deposition zinc-nickel alloy additive and the application thereof, through additive screening and adding, an electroplating process for electro-deposition zinc-nickel alloy is optimized, and a zinc-nickel alloy coating which is bright in appearance, high in hardness and excellent in corrosion resistance is finally obtained; the obtained plating solution is good in stability, dispersity and covering capacity, and the problems that a conventional alkaline zinc-nickel alloy plating solution is poor in stability and low in current efficiency, and an obtained coating is poor in quality are solved fundamentally; and the industrialized application feasibility of the alkaline cyanide-free electro-deposition zinc-nickel alloy additive is improved.

The invention relates to a chemical immersion tin plating solution and a preparation method thereof. The chemical immersion tin plating solution is composed of tin salt, an accelerant, a wetting agentand a stabilizer, wherein the mass concentration of the tin salt is 5-20 g/L, the mass concentration of the accelerant is 30-200 g/L, the mass concentration of the wetting agent is 0.1-0.5 g/L, the mass concentration of the stabilizer is 50-170 g/L. Under reasonable concentration proportioning and the synergistic effect of all the components, the chemical immersion tin plating solution is very stable, the plating layer is uniform, compact and semi-bright, moreover, the used working temperature is not high, the temperature is 35-45 DEG C, plating is carried out for 10-15 minutes, the thicknessof the plating layer can reach about 1.5-2 microns, and the plating layer is good in weldability.

The invention belongs to the technical field of chemical tin plating, and in particular, relates to chemical tin plating liquid and a preparation method thereof. The chemical tin plating liquid contains sulfuric acid, tin salt, complexing agents, multifunctional additives, reducing agents and function auxiliaries; and in the chemical tin plating liquid, the content of the sulfuric acid is 33-40 mL.L-1, the content of the tin salt is 10-15 g.L-1, the content of the complexing agents is 85-95 g.L-1, the content of the multifunctional additives is 0.5-1.2 g.L-1, the content of the reducing agentsis 25-40 g.L-1, and the content of the function auxiliaries is 1-2 g.L-1. The chemical tin plating liquid is excellent in stability, and accelerates the plating layer deposition speed when the stability of the plating liquid is improved.

The invention discloses trivalent chromium electroplate liquid and a preparing method thereof. The trivalent chromium electroplate liquid comprises, by concentration, 0.2-0.35 mol/L of hexahydrate chromium trichloride, 0.25-0.35 mol/L of sodium gluconate, 2.0-4.5 mol/L of glycine, 0.1-0.15 mol/L of aluminum sulfate, 0.002-0.004 mol/L of dodecyl sodium gluconate, 0.4-0.8 mol/L of a complexing agent, 15-20 ml/L of stabilizer and the balance solvent water. The stabilizer is a water solution comprising 2-3 mol/L of methyl alcohol, 2-3 mol/L of sodium sulfite and 1-2 mol/L of ferrous sulfate. Compared with the prior art, the electroplate liquid is stable in performance and long in service life, and the quality of a coating is good. Meanwhile, the preparing method is simple, operation is easy, and very good application prospects and high using value are achieved.

The invention relates to a process for reducing the low internal stress of a hub electroplated layer through a semi-bright nickel electroplating procedure. In a semi-bright nickel electroplating step, a solution formula consists of 100-150g.dm<-3> of nickel sulfate (NiSO4.6H2O), 10-30g.dm<-3> of nickel chloride (NiCl2.6H2O), 20-30g.dm<-3> of boric acid (H3BO3), 1-2g.dm<-3> of sodium dodecyl sulfate, 1-2g.dm<-3> of butynediol and 0.1-0.2g.dm<-3> of sodium maltodextrin, and the operating conditions are that the temperature is 45-55 DEG C, the pH value is 2-3, the anode current density is 1-3A.dm<-2>, the time is 10-20 minutes, and air stirring and continuous filtration are performed. By adopting the process, a metal coating with high bonding force and high corrosion resistance can be obtained on the surface of a magnesium alloy motorcycle hub, the internal stress of the coating is reduced, and the phenomenon of cracking during use is avoided.

The invention relates to a tin plating solution with a formula comprising 20-50 g/L of stannous chloride,150-200 g/L of hydrochloric acid, 5-20 ml/L of a brightening agent, 20-30 ml/L of a stabilizer, 0.5-2 g/L of bismuth nitrate, 20-50g/L of a pH regulator composed of ammonia water and a complexing agent, and the balance being deionized water. Preparation environment of the solution is that a current density is 1.0-2.0 A/dm<2>; a temperature is 20-30 DEG C; a pH value of the plating solution is controlled within 1-2. The solution is reasonable in formula, has good welding properties and can effectively inhibit the growth of crystal whiskers. The plating solution has high stability and long service life.

The invention discloses trivalent chromium electroplate liquid and a preparing method thereof. The trivalent chromium electroplate liquid comprises, by concentration, 0.1-0.15 mol/L of chromium sulfate, 0.25-0.35 mol/L of sodium gluconate, 0.8-1 mol/L of citric acid, 0.1-0.15 mol/L of aluminum sulfate, 0.002-0.004 mol/L of dodecyl sodium gluconate, 0.4-0.8 mol/L of a complexing agent, 15-20 mol/L of a stabilizer and the balanced solvent water. The stabilizer is a water solution which is formed by 2-3 mol/L of methyl alcohol, 2-3 mol/L of sodium sulfite and 1-2 mol/L of ferrous sulfate. Compared with the prior art, the trivalent chromium electroplate liquid has the beneficial effects that the performance is stable, the service life is long, the coating quality is good, the preparing method is simple, the operation is easy, and the great application prospect and the good use value are achieved.