Disclosed are a magnesium alloy fluoride-free chemical nickel-plating solution and a nickel plating technology thereof The nickel-plating solution comprises an alkaline fluoride-free chemical nickel-plating solution and an acid fluoride-free chemical nickel-plating solution The pH value of the alkaline fluoride-free chemical nickel-plating solution ranges from 10 to 12, and the alkaline fluoride-free chemical nickel-plating solution is composed of nickel salt, sodium hypophosphite, citrate, sodium carbonate and thiourea The pH value of the acid fluoride-free chemical nickel-plating solution ranges from four to six, and the acid fluoride-free chemical nickel-plating solution is composed of nickel salt, sodium hypophosphite, citric acid and thiourea The nickel plating technology comprises the following steps of polishing, oil and grease removing, alkali washing, acid washing, activation, alkaline fluoride-free chemical nickel plating, acid fluoride-free chemical nickel plating and passivating The plating solution is free of fluoride, compositions are safe, environment is not polluted, amorphous nickel-phosphorus alloy is arranged on the outer layer of a composite plating layer obtained through nickel plating, the composite plating layer is high in compactness and good in corrosion resistance and binding force, and the good industrial application prospect is achieved

Magnesium alloy fluoride-free chemical nickel-plating solution and nickel plating technology thereof

The invention relates to a multi-layer chemical nickel plating processing method of magnesium-lithium alloys. The processing method comprises the following steps of performing acceptance check before plating; removing oil with an organic solvent; chemically removing oil; carrying outwashing with hot water; carrying outwashing with cold water; performing acid pickling; performing recovering; carrying out washing with cold water; conducting activating for the first time; carrying out washing with cold water; removing activated films; carrying out washing with cold water; conducting activating for the second time; pre-plating chemical plating nickel; performing recovering; carrying out washing with cold water; plating copper in pyrophosphate; performing recovering; carrying out washing with cold water; chemically plating nickel; performing recovering; carrying out washing with cold water; performing sealing; carrying out washing with cold water; carrying out washing with hot pure water; conducting drying with air; performing heat treatment curing; performing inspection; conducting packaging; and carrying out warehousing or performing the next working procedure. According to the method, a creative acid-pickling formula and two-time activation are adopted, so that the bonding force of a plating layer is enhanced; the pyrophosphate with good dispersing capacity is adopted for plating copper, the thickness of the copper plating layer is uniform, and the porosity factor is low, so that the corrosion resistance of the plating layer is improved; a multi-layer plating system is adopted, so that the bonding force of the plating layer is guaranteed, the electrical conductivity of the plating layer is guaranteed, and besides, the corrosion resistance of products is greatly improved.

Multi-layer chemical nickel plating processing method of magnesium-lithium alloys

The invention discloses a multi-component complex agent and acidic chemical plating nickel and phosphorus solution with the same The multi-component complex agent comprises one or two of aspartic acid and glycine, lactic acid, citric acid, malic acid, succinic acid and one or two of malonic acid and propanoic acid The acidic chemical plating nickel and phosphorus solution comprises nickel sulfate, sodium hypophosphite, the multi-component complex agent, sodium acetate, ammonium bifluoride, stabilizers and brighteners The multi-component complex agent and the acidic chemical plating nickel and phosphorus solution have the advantages that after the acidic chemical plating nickel and phosphorus solution is used, the surface areas of plated single-groove workpieces can reach 11000 dm , the surface areas of single-day plated workpieces can reach 1800-2600 dm , the continuous plating time can reach 72 hours, and the thicknesses of plated layers can reach 50-125 micrometers; deviation of the ellipticity of plated rolls and corrugators rolls can be prevented from exceeding standards, the plated layers are excellent in performance, grinding can be omitted, and accordingly the production cost can be saved

Multi-component complex agent and acidic chemical plating nickel and phosphorus solution with same

The invention discloses a method for preparing a nickel-phosphorus-ferrite particle composite coating on a matrix material. The method comprises the following steps of: preparing 20 to 50g/L ferrite aqueous dispersion; preparing a base coating solution; adding the ferrite aqueous dispersion into the base coating solution according to a volume ratio of 1 to 1 so as to obtain a coating solution; and filling the matrix material in the coating solution to coat under the conditions of pH of between 8 and 9 and temperature of between 50 and 70 DEG C for 20 to 50 minutes so as to obtain the nickel-phosphorus-ferrite particle composite coating. The method has the most significant advantage that wave-absorbing material-ferrite particles are compounded with nickel and phosphorus by using a chemicalcomposite coating technology, so that the prepared nickel-phosphorus-ferrite particle composite coating with superior wear resistance and electromagnetic wave shielding and absorbing performance is prepared.

Method for preparing nickel-phosphorus-ferrite particle composite coating

The invention relates to a deposition method for an abrasion-resisting electric conduction nickel plating layer on the surface of a magnesium-lithium alloy The deposition method comprises the following specific operation steps that a magnesium-lithium alloy material is subjected to oil removing, acid micro activation and nickel electroplating; a plating layer material with the thickness ranging from 10 microns to 15 microns is formed on the surface of the magnesium-lithium alloy material; and two-step oil removing of organic solvent oil removing and alkaline chemical oil removing is adopted, and therefore oil dirt on the surface of a magnesium-lithium alloy material test block can be sufficiently removed The magnesium-lithium alloy material is subjected to slight erosion through the strong oxidizing property of acid, the purpose of microcosmic coarsening is achieved, and a magnesium-lithium alloy material layer has a hydrophilic function A method that a metal nano fine particle composite material is formed by an electric conduction fiber in which nano-scale carbon black particles are added and boron nitride nano particles in a nickel electroplating basic formula is utilized, the adhesive force of the magnesium-lithium alloy material surface plating layer can be improved, very good solid solution diffusion is formed between the nickel plating layer and a substrate, and the interface bonding strength is enhanced; and the stress of the plating layer is released, the obtained plating layer is high in appearance quality, the electric conduction performance is excellent, and abrasion resistance is high

Deposition method for abrasion-resisting electric conduction nickel plating layer on surface of magnesium-lithium alloy

The invention relates to a preparation method of a magnesium alloy surface metal plating layer, which belongs to the technical field of metal corrosion and protection. The method comprises the following steps: (1) carrying out preliminary treatment on the surface of the magnesium alloy; (2) carrying out advanced chemical nickel plating on the surface of the magnesium alloy after the preliminary treatment, wherein an advanced chemical nickel solution is prepared from 15 to 30 g/L of nickel hypophosphite, 5 to 20 g/L of sodium hypophosphite, 8 to 30 g/L of organic coordination agents, 10 to 50 g/L of inorganic coordination agents, 3 to 5 g/L of glycin, 5 to 15 g/L of ammonium hydrogen fluoride, 5 to 10 g/L of sodium acetate, 3 to 5 ppm of potash iodate and 10 to 30 mg/L of dodecyl sodium sulfate, the temperature of the advanced chemical nickel plating is between 50 and 70 DEG C, the pH value is between 7 and 10, and the time is between 30 and 120 min; and (3) carrying out thickening chemical nickel plating or plating other metals on the surface of the magnesium alloy after the advanced chemical nickel plating. The method of the invention improves the combining force of an advanced plating layer and a magnesium alloy base body, and reaches the national standard after the addition of a proper amount of pyrophosphate complexing aids. Metal decorative protective plating layers with strong combining force and high corrosion performance can be obtained after further conventional nickel plating or other metal plating on the advanced chemical nickel plating layer.

Liping Wu

Papers

Preparation method of magnesium alloy surface metal plating layer