43 results about "Chromium product" patented technology

The invention discloses a nickel-chromium plating part and a manufacturing method thereof. The nickel-chromium plating part includes a substrate, a pretreatment coating and a decorative layer. The pretreatment coating is deposited on the entire substrate, and a copper plate layer and a functional layer are formed on the pretreatment coating; the functional layer is formed on the copper plate layer; the functional layer includes a low potential nickel layer and a microporous nickel layer formed on the low potential nickel layer; and the decorative layer is formed on the microporous nickel layer. Based on the micropores on the part surface and chrome plating technology, the low potential nickel layer is added to improve the corrosion resistance of the product, especially the corrosion resistance of trivalent chromium plating product, so as to promote the large scale popularization and application of the trivalent chromium product, which has better environmental protection performance.

The invention relates to a surface treatment method of plastic parts. The surface treatment method comprises the following steps: 1) cleaning the surface of a workpiece; 2) spraying a first organic coating; 3) putting the workpiece into an infrared furnace to carry out leveling drying; 4) putting the workpiece into an ultraviolet curing oven to carry out curing by ultraviolet radiation; 5) hanging the workpiece to a PVD (Plating Vacuum Deposition) furnace, carrying out vacuum evaporation and plating aluminum films to obtain a semi-finished product of which the surface is silver and bright; 6) spraying a second organic coating to the semi-finished product; 7) putting the workpiece into the infrared furnace to carry out pre-drying leveling; 8) putting the workpiece into the ultraviolet curing oven to obtain a finished product. According to the invention, the technological process is simple, the energy consumption is low, zero discharge of wastewater is realized in the whole process, and the pollution to the surrounding environment is avoided; furthermore, the raw materials are low in price and easy to purchase, and no obvious differences occur between the appearance and performances of the coating and the appearance and performances of an electroplating chromium product, and the coating has good corrosion resistance, excellent salt fog performances and higher level in comparison with the traditional plating SC4, so as to be especially suitable for harsh environments of bathrooms and the like.

A method for recycling and preparing metal chromium comprises the steps of recycling chromium element from discharged waste liquid and discharged waste material, and utilizing the recycled chromium element to prepare metal chromium. The method prevents environmental pollution, realizes application of chromium resources, is simple in technology and low in cost, and can obtain metal chromium products which can meet the use requirement.

The present invention relates to one kind of selenium-rich and chromium-rich Saccharomyces cerevisiae, selenium-rich and chromium-rich Saccharomyces cerevisiae product and their production process. Of the selenium-rich and chromium-rich Saccharomyces cerevisiae product, each kilogram contains selenium in 100-4000 mg and chromium in 100-4000 mg. The selenium-rich and chromium-rich Saccharomyces cerevisiae may be used as selenium and chromium replenisher added into various food products or prepared into alone preparation. The selenium-irch and chromium-rich Saccharomyces cerevisiae product has lower toxicity than inorganic selenium and chromium product and high safety, and may be used in replenishing both selenium and chromium.

The invention discloses a method for separating a vanadium and chromium solution and recycling vanadium and chromium. A reducing agent is added to the vanadium and chromium solution under the condition that the pH value ranges from 8 to 14, and the temperature ranges from 20 DEG C to 100 DEG C, and pentavalent vanadium and hexavalent chromium are reduced into tetravalent vanadium and trivalent chromium; the trivalent chromium forms chromic hydroxide precipitate in situ, and a chromic hydroxide filter cake and vanadium-containing filtrate are obtained through filtering; the chromic hydroxide filter cake is used for preparing chromic oxide; and the vanadium-containing filtrate is used for preparing hydration vanadium dioxide or vanadyl sulfate or vanadium pentoxide. By means of the method, efficient separation and recovery of vanadium and chromium are achieved, the vanadium recovery rate reaches 96% or higher, the chromium recovery rate reaches 98% or higher, and the purity of vanadium and chromium products reaches 98% or higher. The method has the beneficial effects that the technological processes are short, the separation efficiency is high, the cost of raw materials and auxiliary materials is low, operation is easy and convenient, and the method can be used for large-scale industrial production.