31results about How to "No missing plating" patented technology

The invention relates to coating thickness reduction ammonium salt-free plating auxiliary for hot galvanizing by a solvent method. The plating auxiliary comprises the following components: 80-140g / L of ZnCl2, 5-60g / L of NaCl, 1-5g / L of MgCl2, 1-6g / L of KCl, 2-6g / L of oleic acid, 2-10g / L of NiCl2 and the balance of water. The plating auxiliary provided by the invention can solve the problem of pollution and super-thick coating during hot galvanizing by the solvent method. The plating auxiliary provided by the invention is simple in production process, and a uniform solvent film is formed on a pre-plating piece. During hot galvanizing, dense smoke and skip plating are avoided, the coating is bright in surface, the alloy layer in the zinc layer is thinned and the coating is thinned by over 50%, so that the zinc consumption and cost are reduced. The plating auxiliary provided by the invention is suitable for an ammonium salt-free plating assistant process for hot galvanizing by the solvent method with the thinned coating.

The invention provides an electroplating solution bright additive and auxiliary additive for electroplating a bright nickel-titanium alloy. The bright additive is composed of 30-40 g / L propane sulfonate pyridine, 40-50 g / L propane alcohol ethoxy ether, 30-50 g / L N,N-diethylallylene amine formate, 5-10 g / L propiolic alcohol, 10-12 g / L sodium hydroxymethyl sulfonate and the balance of distilled water or deionized water. The auxiliary additive is composed of 180-200 g / L saccharin (or soluble saccharin), 200-250 g / L dilute sodium propyl sulfonate (35%), 5-10 g / L sodium hydroxypropyl thiosulfate and the balance of distilled water or deionized water. The additives are simple in components, non-toxic and pollution-free, and free of Cr<6+>.When the invention is used for electroplating the bright nickel-titanium alloy, the wear resistance, corrosion resistance and toughness of the coating are greatly enhanced. The invention has very important actions in common industry and in the fields of military affairs, national defense, aerospace and submarine ships.

The invention discloses equipment for preparing a nano coating on the surface of diamond by means of double-cathode plasma sputtering deposition, and a preparation process of the equipment. The equipment comprises a vacuum chamber, a double-cathode structure, a target device, a material disc, an oscillator, a gas inlet and a gas outlet, wherein the double-cathode structure comprises two anodes and two cathodes, wherein one of the cathodes is connected with the target device, and the other cathode is connected with the material disc. A coating is formed on the surface of the diamond through target metal by adopting the double-cathode plasma sputtering deposition means, by adjusting the voltages of a target and the material disc and the distance between the target and the diamond in the material disc, and by controlling the deposition time and the temperature. Due to the double-cathode plasma sputtering deposition means, the prepared coating and the diamond have good bonding force.

A process for plating Galfan alloy on the surface of steel wire includes such steps as paying off, degreasing, pickling, water washing, preplating in electrolytic liquid prepared from zinc sulfate, catalyst GD-L and water, baking, hot dipping for plating, vertically leading out, wiping, forced cooling and winding. In said hot dipping step, an internal heater made of anticorrosion alloy pipe is used.

The invention provides a hot-plating zinc-aluminum-magnesium alloy coating and a preparation method and application thereof. The coating is prepared from the following chemical components in percentage by mass: Zn:Al:Mg:RE=(86.50 to 98.49):(1 to 10):(0.5 to 3):(0.01 to 0.5), wherein RE is La, Ce or mixed rare earth. The hot-plating zinc-aluminum-magnesium alloy coating for a bridge cable steel wire is controllable in thickness, high in adhesion, is not prone to peeling off and is excellent in surface quality; a preparation technology is simple, plating omission is avoided, the hot plating temperature is significantly decreased (from the original 500 DEG C or above to 420 DEG C-480 DEG C), and the matrix steel wire strength loss is controlled within 50 MPa; and corrosion resistance is obviously better than that of a current zinc coating and a zinc-aluminum alloy coating, the demands of the complex environment on high comprehensive performance of the bridge cable steel wire are met, andwide market application prospects are achieved.

The invention provides a preparation method of an environment-friendly zinc-aluminum-magnesium alloy coated steel plate. The preparation method comprises the steps of conducting pretreatment on a hotrolled low-carbon steel plate through mechanical derusting and electrolytic degreasing, heating the steel plate through a high-frequency induction heating device and conducting reduction on the pretreated steel plate in an N2-H2 mixed atmosphere to obtain a proper hot dip-coated surface; cooling the steel plate in an N2 atmosphere, controlling the temperature of the steel plate before dip platingand conducting dip plating in a zinc-aluminum-magnesium alloy plating solution; and then cooling the steel plate in the air. Through the preparation method, harm of pollutants generated in the traditional acid pickling, derusting and assistant plating process to human bodies and environments is avoided; the more and more strict requirements for environmental protection are met; the quality of a plating layer is improved, and the preparation method has broad application prospects.

The invention relates to an environment-friendly rust removing and resisting agent applied to acid pickling. The rust removing and resisting agent is prepared from the following raw materials in percentage by mass: 17-35% of phosphorous acid, 1-8% of zinc dihydrogen phosphate, 1-8% of an oxidant, 1-10% of a complexing agent, 0.05-5% of a passivator, 0.01-2% of a surfactant, 0.01-2% of a corrosioninhibitor and the balance of water, wherein the oxidant is selected from one or two of cerous nitrate or zinc nitrate; the passivator is sodium molybdate; the corrosion inhibitor is selected from oneor two of rodine and benzotriazole; the surfactant is selected from JFC (fatty alcohol-polyoxyethylene ether) and OP-10 (alkylphenol polyethylene ether). Through the rust removing and resisting agent,the rust removing and resisting effect can be achieved by carrying out acid pickling under the normal temperature; a good galvanization effect can also be achieved after steel products are placed inthe air for a period of time after removing rust; meanwhile, the rust removing and resisting agent has the advantages of low production cost, simple operation process, no harm to operators and environment friendliness.

The invention discloses an overhead ground wire used in a severe corrosive environment and long in service life and a cladding layer thereof. The cladding layer is prepared from a metal plating solution which is composed of, by weight percentage, 25%-65% of aluminum, 1%-2.5% of magnesium, 0.2%-1.5% of cerium-containing rare earth, 0.1%-0.2% of molybdenum, 0.05%-0.1% of vanadium and the balance zinc. In order to achieve corrosion resistance protection for the overhead ground wire, the anti-corrosion cladding layer which has a high alloy content, meets various property requirements of a zinc, aluminum and magnesium alloy cladding layer, is prepared on the surface of the overhead ground wire and is high in corrosion resistance and long in service life is provided, can be widely applied to the overhead ground wire used in a severe corrosive environment (such as a coastal area, an acid rain area and an industrial pollution area) and meets the requirements that the service life is long, and the maintenance-free time is not less than 15 years.

The invention discloses a highly corrosion-resistant single-coated zinc-aluminum-magnesium rare-earth protective coating and a preparation process thereof. The single-coated zinc-aluminum-magnesium rare-earth protective coating process of the present invention can utilize a single hot dipping method to obtain zinc and aluminum on the metal surface Magnesium alloy coating. The coating and the metal substrate each maintain their original performance, but have more than 99.9% of the metallurgical bonding interface. At the same time, the coating has a dense structure, stable composition, no missing plating, excellent corrosion resistance, and salt spray corrosion up to 2060h. The corrosion resistance of the alloy coating is better than that of ordinary hot-dip pure zinc coating, which improves the service life. The single-plating process can be reused and industrialized, and it overcomes the difficulties of metal and zinc-aluminum-magnesium alloy liquid electroplating. It is difficult to form an excellent bonding interface between the two, and it is easy to produce missing plating. It can be widely used in the preparation of metal surfaces. 5%-12% Al, 1%-6% Mg content of zinc-aluminum-magnesium alloy plating solution, the prepared co-permeation layer forms Zn / Al / MgZn2 ternary eutectic and various types of binary eutectic, which is eutectic The main reason for the high corrosion resistance of the seepage layer.