50results about How to "Phosphating time is short" patented technology

The invention provides a slag-free low-temperature rapid electrolytic phosphating solution and a phosphating process thereof. The phosphating solution contains zinc ions, phosphate radicals, accelerators, organic acids and dissolved metal elements, and its mass components are as follows: zinc ions 10-80g / L, phosphate radicals 10-120g / L, accelerators 41-160g / L , organic acid 0‑5g / L, dissolved metal elements 0.1‑10g / L, where phosphate is calculated as P2O5. This process uses an inert titanium plate or mesh as the positive electrode, and the treated steel wire as the negative electrode. A certain current is applied to form a uniform zinc phosphate film on the surface of the steel wire. The film weight reaches more than 4g / m2, which meets the drawing requirements. The phosphating temperature of the invention is 10-60 DEG C, the phosphating time is 5-120 seconds, and no phosphating slag is generated, so it has the obvious advantages of high efficiency, energy saving and environmental protection.

The invention provides a normal-temperature sludgeless fast phosphating liquid and a preparation method thereof. The normal-temperature sludgeless fast phosphating liquid is prepared from the following raw materials by mass percent: 10-20% of phosphoric acid, 6-10% of zinc oxide, 20-25% of zinc nitrate, 1-5% of sodium metanitrobenzene sulfonate, 0.5-2% of sodium citrate, 1-4% of ethylenediamine tetraacetic acid (EDTA), and the balance of water. The phosphating film copper sulfate droplet test time of the phosphating liquid disclosed by the invention can be up to 30 seconds, the neutral salt spray test time can be up to 4 hours, the adhesive force of a paint film can be up to 0 grade, meanwhile, the phosphating time is short, the work efficiency is greatly improved, the operating temperature is low, a phosphating sediment is basically not generated, the cleaning cycle is greatly prolonged, the solid waste treatment cost is reduced, and energy consumption does not need to be consumed.

The present invention discloses a kind of low temperature fast phosphatizing solution for treating the welded area in drawn high carbon coil rod and its phosphatizing process. The low temperature fast phosphatizing solution of the present invention has lubrication on the welded area to avoid crack and breaking. The low temperature fast phosphatizing solution has hydroxylamine sulfate to replace traditional harmful NaNO2, and possesses environment friendship, high stability and long service period.

The invention discloses a method for preparing a high-temperature-resistant lithium iron phosphide high-temperature-resistant phosphating film material for metals, belonging to the technical field of metal surface treatment, and the invention is obtained through the following steps. Firstly, the metal substrate is selected, and the metal surface is cleaned, and the chemical composition is given according to the invention, and the mass ratio is: (159.68): (65.88): (254.11): (12). Put the above-mentioned substances into a crucible, fully stir them with a glass rod, put them into a box-type resistance furnace, slowly raise the temperature from a room temperature of 20°C, and keep the temperature for 30min when the resistance furnace rises to 500‑800°C to obtain a solid lithium iron phosphate . Put the obtained lithium iron phosphate powder and phosphoric acid in a phosphating solution with a mass ratio of 1:2, put the blank to be treated into the phosphating solution, and the blank can obtain a dark gray phosphating film. Finally, the blank is heated to remove hydrogen to reduce the harm of hydrogen embrittlement. The saponification process is carried out to further enhance the lubrication between the extrusion billet and the die.

The invention provides a normal-temperature rapid phosphating solution and a preparing method thereof. The normal-temperature rapid phosphating solution comprises the following raw materials in percentage by mass: 10-20 percent of phosphoric acid, 6-10 percent of zinc oxide, 20-25 percent of zinc nitrate, 1-5 percent of sodium 3-nitrobenzene sulfonate, 0.5-2 percent of sodium citrate and water in balancing amount. A coating which is phosphated by the normal-temperature rapid phosphating solution can last 45 seconds in a copper sulfate drip test and can last 4 hours in a neutral salt mist test, and the adhesive force of a paint coating reaches 0 grade. Meanwhile, the normal-temperature rapid phosphating solution has the characteristics of short phosphating time and low use temperature. The production efficiency is increased, and a large quantity of energy is saved.

The invention discloses a method for environment-friendly, low-temperature and rapid preparing of a phosphating film. The method comprises the steps that firstly, raw material components including, by mass, 5-8 parts of dihydric phosphate, 6-9 parts of nitrate, 0.5-3 parts of phosphoric acid, 0.05-0.5 part of oxidized graphene, 0.1-1 part of stabilizer, 6-10 parts of pH buffering agents and 100-120 parts of water are thrown into a reaction kettle, the temperature is increased to 20-40 DEG C, and after stirring is conducted for 20-60 min, the mixture is discharged out of the kettle; and secondly, a prepared phosphating solution is placed in a phosphating pond, the phosphating temperature is increased to 15-40 DEG C, then a steel test piece is placed in the phosphating pond, treatment is conducted for 2-20 min, airing is conducted, and the phosphating film is obtained. The obtained phosphating film is grey and bright in appearance, has good corrosion resistance and is good in attaching force with paint. The phosphating method is high in phosphating speed and low in phosphating temperature. A film layer is fine in crystal, the phosphating liquid is stable, little sediment exists, no toxicity or harm is generated to people and the environment, and cost is low.

The invention relates to the field of a phosphate solution formulation. The solution is especially suitable for the phosphating process before hot stamping of an ultra-high-strength steel blank, and the surface treatment of the ultra-high-strength steel blank needs to be carried out by a composite phosphate solution. , to obtain a layer of high-temperature-resistant composite lithium iron phosphate-calcium sulfate film to improve the life of the mold. Given the chemical composition ratio according to the invention, configure a composite lithium ferrous phosphate-calcium sulfate surface treatment solution suitable for hot stamping of ultra-high-strength steel sheets: first pass iron oxide Fe2O3, lithium hydroxide LiOH H2O, hydroxide Lithium LiOH H2O, ammonium dihydrogen phosphate (NH4) 2HPO4, carbon source C to synthesize lithium iron phosphate, followed by calcium sulfate CaSO4 ultrafine powder, lithium iron phosphate ultrafine powder LiFePO4, phosphoric acid H3PO4, and distilled water H2O, according to its The mass ratio is: (40‑60): (10‑30): (5‑10): (808‑912). Put the ultra-high-strength steel blank to be treated into the phosphating solution at 55°-60°C, and the blank can obtain a dark gray phosphating film. Finally, the blank is heated to remove hydrogen to reduce the harm of hydrogen embrittlement. The saponification process is carried out to further enhance the lubrication between the hot stamping sheet and the mold.

The invention discloses a composition for steel phosphating and a preparation method thereof. The composition is composed of the following components in parts by mass: 2-6 parts of sodium nitrate, 2-4 parts of sodium citrate, 15-25 parts of iron manganese dihydrogen phosphate, 5-10 parts of magnesium oxide, 10-20 parts of nickel nitrate, 2-5 parts of copper sulfate, 1-3 parts of sulfosalicylic acid, 2-5 parts of polyethyleneglycol and 500-900 parts of deionized water. The preparation method comprises the following steps: a. weighing the components according to parts by mass; b. adding the sodium citrate, sulfosalicylic acid and polyethyleneglycol into another deionized water; and c. uniformly mixing the solutions obtained in the step a and step b. The composition for steel phosphating can complete phosphating within 8-10 minutes, and has the advantages of high phosphating speed and short required lime for phosphating; and the surface of the phosphated steel has bright color.

The invention relates to a steel phosphorization process. The steel phosphorization process comprises the following process steps including (1) grease removal, (2) water washing, (3) acid pickling, (4) secondary water washing, (5) neutralizing and (6) surface conditioning, wherein steel treated in the step (5) is placed into surface conditioning liquid at the temperature ranging from 40 DEG C to 45 DEG C to be treated for 1 min to 2 min, and the surface conditioning liquid is composed of 0.08-0.3 kg of a surface conditioning agent and the balance water in every 100 L of surface conditioning liquid; raw materials for preparing the surface conditioning agent comprise, by weight, 200-250 parts of water, 60-80 parts of disodium hydrogen phosphate, 40-60 parts of sodium tripolyphosphate, 2-5 parts of sodium hydroxide, 5-8 parts of potassium fluotitanate, 10-25 parts of amino trimethylene phosphonic acid and 2-5 parts of sodium pyrophosphate; and by means of the phosphorization process, all growth processes of a conversion coating can be conveniently completed at the low phosphorization temperature within short time, coating crystals are compact and even, and the attachment force is high.