66results about How to "Avoid over corrosion" patented technology

The invention relates to an environmentally-friendly chemical deplating agent for a nickel plating and a deplating method. The deplating agent comprises the components of 30 g / L to 100 g / L of sulfuric acid, 30 g / L to 140 g / L of oxalic acid, 10 g / L to 30 g / L of sodium citrate, 10 g / L to 60 g / L of sodium acetate, 15 g / L to 60 g / L of sodium gluconate, and the balance being water. According to the environmentally-friendly chemical deplating agent, oxalic acid is added based on sulfuric acid, acidity of oxalic acid is not high, and overetching of the nickel plating can be prevented; oxalic acid can provide hydrogen ions used for corroding the plating, and the deplating purpose of the nickel plating can be achieved through only a relatively small amount of sulfuric acid; deplating speed is high, efficiency is high, a deplated stainless steel matrix is smooth in surface, overetching is avoided, and follow-up reutilization and processing are not affected; and oxalate and nickel ions generate nickel oxalate sediment through complexing, nickel is directly sedimented and separated from the system, the follow-up step of recycling nickel metal from deplating waste water is eliminated, nickel oxalate can be directly recycled, and utilization is convenient.

The present invention discloses a detergent and a cleaning method for a complete air-conditioner, which not only can uniformly and completely remove dirt but also cannot strongly corrupt components and parts such as aluminum, copper and stainless steel, are time-saving and labor saving, safe and reliable, and pollution-free, and have low cost. Raw materials of the detergent are at least two compositions of citric acid, inorganic weak acid and inorganic strong acid; a non-ionic surfactant or a non-ionic surfactant is mixed with an anionic surfactant; and the detergent comprises an oxygen solvent, an acid corrosion inhibitor, and the balance being water. The cleaning method comprises: disassembling a motor and a fan, and taking off the motor and the fan for independent cleaning; preparing the detergent into an aqueous solution according to the proportion of between 10 and 15 percent, hanging the complete air-conditioner after disassembly of the motor and the fan into a cleaning tank, soaking the complete air-conditioner for 30 minutes at normal temperature, and starting ultrasonic waves to clean for 10 to 30 minutes; placing the complete air-conditioner into a washing tank, and using a high-pressure water gun to spray the surface and the inside of the air-conditioner; and using hot blast to dry the air-conditioner at a temperature of 80 DEG C.

The invention discloses a low-cost and non-polluting method for removing the residual paraffin in the separator, converting elemental mercury into a non-volatile compound, and avoiding corrosion of carbon steel and stainless steel. Mercury alkaline cleaning agent and cleaning process. The raw materials and weight percentages are as follows: at least two of sodium sulfide, sodium polysulfide and sodium thiosulfate, wherein sodium sulfide is 1-40%, sodium polysulfide is 0.1-15%, and sodium thiosulfate is 1-35%; At least one of sodium nitrate, sodium phosphate, and sodium sulfate, the content of which is 0.1-10%; one of sulfuric acid and phosphoric acid, the content of which is 0.1-15%; nonionic surfactant 0.5-20%; anionic surface active agent Active agent 0.5-10%; oxygen-containing solvent 0.5-15%; corrosion inhibitor 0.1-10%; water less than or equal to 90%; pH value greater than 10.0.

The present invention provides method of raising binding force of chemical coating on the surface of NdFeB permanent magnet. The NdFeB permanent magnet is pre-coated in alkaline plating solution under ultrasonic action, and by means of the activation, cavitation and stirring of ultrasonic wave, one homogeneous and compact initial deposited layer is formed on the surface of the magnet, so as to raise the binding force of chemical nickel-base coating on the surface of the magnet obviously and reduce pores in the coating. The present invention also provides the technological process including deoiling and pickling to activate before plating, the ultrasonic pre-plating and the conventional chemical plating. The formed coating has high corrosion resistance, raised binding to the substrate and perfect protection on the NdFeB permanent magnet.