4 results about "Basic chromium sulfate" patented technology

The application provides a trivalent chromium passivation solution for maintaining the original color of aluminum alloy, which is prepared from basic chromium sulfate, zirconium salt, fluoride salt, corrosion inhibitor, organic acid complexing agent and water. The application also provides a preparation method of the trivalent chromium passivation solution for maintaining the original color of aluminum alloy, which comprises the following steps: heating water to 75-85 DEG C, then adding basic chromium sulfate, stirring while adding until completely dissolved, then adding zirconium salt, fluoride salt, corrosion inhibitor, organic acid complexing agent, silane coupling agent, water-soluble resin and nano silicon dioxide in sequence, and stirring for 1-2 h; using a pH regulator to adjust the pH value to 3.8-4.2, and the trivalent chromium passivation solution for maintaining the original color of aluminum alloy is obtained. The application also provides a passivation method for maintaining the original color of aluminum alloy. The application has the advantages of saving raw material cost, simple preparation method, and the like, and the passivated aluminum alloy part has a dense and uniform passivation film, the appearance color is maintained as the original color, the corrosion resistance exceeds 300 hours after neutral salt spray test, and the corrosion resistance is good.

The utility model discloses a device for extracting basic chromium sulfate from leather-making chrome tanning waste liquid, which belongs to the field of wastewater treatment and recycling, and is characterized in that trivalent chromium in the chrome tanning waste liquid is enriched and purified by using amphoteric ion exchange fibers according to the ion exchange principle, so that the total chromium discharge in the treated chrome tanning waste liquid is stable and reaches the standard, and meanwhile, the basic chromium sulfate is extracted from the leather-making chrome tanning waste liquid. The basic chromium sulfate concentrated solution is obtained through regeneration and is reused in the processes of pickling, tanning and the like, and the tanning production requirement is met. According to the device, the loss of chromium is greatly reduced, the production cost of an enterprise is reduced, secondary pollution is avoided, and the device has a good popularization prospect.

The invention discloses a high-temperature type trivalent chromium plating solution for high-speed chromium plating, which comprises the following active ingredients: 30-120 g / L of trivalent chromium main salt; the trivalent chromium main salt comprises at least one of basic chromium sulfate, chromium sulfate and chromium potassium sulfate; the content of the complexing agent is 90 to 150g / L; the complexing agent comprises at least two of formate, glycine, citric acid, citrate and urea; the content of the conducting salt is 100 to 200g / L; the content of the buffering agent is 30 to 50g / L; the content of the brightening agent is 1.5 to 3g / L; the content of the surfactant is 0.4 to 0.9 g / L; the content of the stabilizer is 4-8 g / L; the pH value of the trivalent chromium plating solution ranges from 1.5 to 4.5. According to the trivalent chromium plating solution, the deposition rate of the sulfate system trivalent chromium plating solution can be effectively increased, and a uniformly-distributed plating layer can be obtained within a short time.

The utility model belongs to the technical field of chromic sulfate production equipment, especially relates to a feeding device for base type chromic sulfate production, including feeding device body, the feeding device body includes feeding mechanism, one side of feeding mechanism is provided with the mechanism of containing material, the output of auger conveyor is provided with the isolation subassembly, the below of isolation subassembly is provided with the material storage subassembly, the below of material storage subassembly is provided with the material discharge subassembly that gathers and divides the function in one, the mechanism of containing material includes the frame, the inside of frame is provided with the casing of U shape design, be provided with stirring subassembly in the casing, the utility model discloses reasonable in design, simple structure, processing is convenient and can realize the acceptance of production material on one hand, guarantees the smooth development of conveying work, can realize the quantitative export of conveying material on the other hand, prevents the material from piling up, ensures its subsequent dispersion effect, guarantees the smooth development of processing work, improves work progress, satisfies the use demand.