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

The invention relates to a plating assistant agent for zinc-aluminum-magnesium alloy hot dipping for a steel wire and belongs to the technical field of steel and iron material surface plating processes. The plating assistant agent is composed of 35-45 percent of ZnCl2, 2-10 percent of NaF2, 0.5-3.5 percent of CeCl2, 4.5-8.5 percent of SnCl2, 0.5-2 percent of H2O2, 0.1-05 percent of a surfactant and water in balancing amount. The surfactant is fatty alcohol ether sodium sulfate and/or sodium dodecyl sulfate. According to the invention, through a reasonable plating assistant agent formula, zinc-aluminum-magnesium alloy plating is obtained on the surface of the steel wire through hot dipping. The plating and the steel wire keep original performance respectively, more than 99.9 percent of a metallurgical bonding interface is obtained, the plating is compact in structure, plating leakage is avoided, and a zinc-aluminum-magnesium ternary eutectic with excellent corrosion resistance is formed. The corrosion resistance performance of the alloy plating is 2-4 times than that of normal hot-dipped pure zinc plating. The plating assistant agent is low in cost, can be used repeatedly and facilitates industrial production.

The invention provides a hot galvanizing method. The method comprises the following steps: washing ironware to be galvanized with acid, soaking the ironware in a plating assistant solvent for 5-10 minutes, taking out, and drying with hot air for 10-30 minutes under the condition of 80-100 DEG C; soaking in a hot galvanizing bath to contact the galvanizing solution, and controlling the temperature of the galvanizing solution at 460-480 DEG C; after 1-5 minutes, taking the ironware out of the galvanizing solution, and quickly cooling with air flow at 20-30 DEG C; and transferring the ironware out of the galvanizing region to obtain the galvanized ironware. The ironware made by the galvanizing method has the advantages of compactness, no galvanizing leakage, regular surface, uniform coating and corrosion resistance. The invention is suitable for hot-galvanizing an alloy layer on an iron surface.

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 a hot galvanizing technology process for a steel iron plate. A hot galvanizing technology comprises the following steps of degreasing, acid pickling, plating auxiliary soaking, drying preheating, heat plating, organizing, passivating, cooling and inspecting. By means of the hot galvanizing technology, a plating layer of a workpiece has the advantages of being compact, free of skip plating, regular in surface, uniform and resistant to corrosion, and the hot galvanizing technology is suitable for being applied to a hot galvanizing alloy layer on the surface of steel iron.

The invention discloses a single plating type zinc-aluminum-magnesium-rare earth protection coating with high corrosion resistance and a preparation technology. According to the single plating type zinc-aluminum-magnesium-rare earth protection coating technology, a zinc-aluminum-magnesium alloy coating can be acquired on a metal surface with a single hot dipping method; respective original performance of the coating and a metal matrix are kept, but the coating and the metal matrix form a metallurgical bonding interface of more than 99.9%, meanwhile, the coating is compact in structure, has stable components and excellent corrosion resisting performance and avoids skip plating, and salt-spray corrosion reaches 2,060 h; the corrosion resistance of the alloy coating is better than that of a common hot dipping pure-zinc coating, and the service life is prolonged. The single plating type technology can be reused and applicable to industrial production, overcomes defects that assistant plating of metal and a zinc-aluminum-magnesium alloy liquid is difficult, an excellent metallurgical bonding interface between the metal and the zinc-aluminum-magnesium alloy liquid is difficult to form, the probability of skip plating is high and the like, and can be widely applicable to preparation of a zinc-aluminum-magnesium alloy plating solution containing 5%-12% of Al and 1%-6% of Mg on the metal surface; a prepared co-penetrated layer forms Zn/Al/MgZn2 ternary eutectic and multiple types of binary eutectic, and the eutectic is the major reason for guaranteeing high corrosion resistance of the co-penetrated layer.

The invention provides a novel plating auxiliary for single hot-dipping of a Galfan alloy in a solvent method and a preparation method thereof. According to the plating auxiliary, per liter of the plating auxiliary is prepared from the following components of 100-150 g/L of ZnCl2, 50-100 g/L of ZnBr, 10-20 g/L of SnCl, 8-12 g/L of KF, 0-0.5 g/L of bismuth chloride, 0.5-2 g/L of sodium borohydride,0.1-0.3 g/L of hydrochloric acid, 5-15 g/L of active alkali metal chloride salt and the balance water. The plating auxiliary has the advantages that the zinc bromide, the sodium borohydride and the potassium fluoride are introduced into the plating auxiliary, so that a surfactant and rare-earth chloride which are expensive in price are avoided, the application range is wider, almost all steel products are covered, and therefore the problems of serious skip plating, air holes, list edges, slag inclusion and the like in the Galfan alloy hot-dipping process in the prior art can be effectively solved; and the plating auxiliary can play a good plating assisting role when being used at room temperature, the production cost is greatly saved, the components of the plating auxiliary are stable, the cost is low, and industrial popularization is facilitated.

Provided is a process for local electroplating of internal threads of a nut. The workpiece nut is completely electroplated, and then protection, abrasive blasting, shot blasting, disassembly and aftertreatment are carried out. The process comprises the steps of pretreatment of the workpiece nut, electroplating, tool protection of the internal threads, abrasive blasting for removing plating layers on the outer surface, shot blasting for improving the surface smoothness of the part, disassembly, and aftertreatment. A protection tool is made of a nylon material and is in close fit through threads, and the two ends for tool protection are tightened in the protection process so that the protection tool can be prevented from falling and damaging plating layers of the internal threads in the abrasive blasting and shot blasting processes; the batches of plating layers can be rapidly removed through abrasive blasting, and the glossiness of the surface of the part can be improved and the roughness of the surface of the part can be reduced through shot blasting. The process is easy and convenient to implement, high in efficiency, free of plating missing, discoloration, corrosion and plating layer unevenness, low in cost, small in pollution, capable of achieving the qualified rate higher than 99% and high in universality, and can be applied to local electroplating of internal thread or external thread fasteners.

The invention provides a non-palladium activation copper plating process. The process comprises the following steps of S1, removing oil; S2, coarsening, coarsening a workpiece by adopting a coarseningsolution, and then carrying out ultrasonic washing; S3, sensitizing, putting the washed workpiece into a sensitizer to be sensitized, wherein the sensitizer is prepared from the following componentsof, in concentration ratio, 5-100g/L of tin methanesulfonate, 1-50g/L of tartaric acid, 1-10g/L of ascorbic acid, 5-50g/L of citric acid, 1-20g/L of 2, 4-aminopyridine, 1-10ml/L of an amino silane coupling agent and 1-10ml/L of a surfactant; S4, activating, putting the sensitized workpiece into an activating agent to be activated, wherein the activating agent is prepared from the following components of, in concentration ratio, 1-20g/L of silver nitrate, 1-50ml/L of ammonia water, 1-50g/L of EDTA, 1-20ml/L of triethanolamine, 0.5-5g/L of 2, 4-aminopyridine and 0.1-10ml/L of phosphate surfactant; S5, pre-coppering; and S6, thickening-copper. The invention provides the non-palladium activated copper plating process, the sensitizer and the activating agent thereof which is low in production cost, good in plating bonding force, green and environment-friendly.

The invention discloses a no-zinc-ammonium hot-dip galvanizing smokeless promotion flux comprising 100-210 g/L of alkaline earth metal chloride, 10-40 g/L of alkali chloride, 20-60 g/L of cerium chloride, 5-20 g/L of alkali metal fluoride, 5-10 g/L of hydroxylamine hydrochloride, 0-30 g/L of alkali metal hydroxide, 1-10 g/L of anionic surfactant, 1-5 g/L of a nonionic surfactant, and the balance water. The technical formula does not contain zinc chloride and ammonium chloride, after the treatment of promotion flux, the hot-dip galvanizing process has no smoke volatilization, and the zinc ingotconsumption can be obviously reduced, and positive accelerations of improving the production environment and reducing the production cost are achieved.

The invention discloses a plating auxiliary of a hot-dipped galvanized aluminum alloy plating layer. The plating auxiliary is composed of 70-180 g/L of zinc chloride, 10-40 g/L of aluminum chloride, 5-18 g/L of yttrium chloride, 5-16 g/L of calcium chloride, 18-50 g/L of potassium fluoride, 7-20 g/L of stannous chloride, 15-50 g/L of ethyl alcohol, 0.1-8 g/L of polyoxyethylene alkylation ether, 0.1-6 g/L of N-propyl, N-ethoxyl perfluorooctanesulfonamide, 1-8 g/L of hydrogen peroxide and the balance water. The plating auxiliary of the hot-dipped galvanized aluminum alloy plating layer is environment-friendly in material, excellent in plating auxiliary effect, good in smoothness of plating layer and free of plating leaking.

The invention discloses a zinc electroplating jig for an electroplated product. A jig rod is included and provided with clamp hook assemblies and a hanging assembly, and the hanging assembly is provided with hooks. The provided zinc electroplating jig for the electroplated product has the beneficial effects that products cannot be twisted together so that electroplating neglecting of the products can be avoided, and meanwhile mechanical damage is avoided. Product surface electroplating is uniform, electroplating marks cannot be generated, clamp hooks are arranged at the two ends of the jig rod so that the jig can be used front and back, and personnel operation is convenient.