3results about How to "Avoid excessive corrosion" patented technology

A highly efficient and environmentally friendly liquid metal degreasing agent and its preparation method are disclosed, belonging to the field of metal surface treatment technology. This degreasing agent is composed of a pH adjuster (a mixture of aminosulfonic acid and citric acid), a composite surfactant (a mixture of nonionic and anionic surfactants), a phosphorus-free chelating agent, a composite corrosion inhibitor, a defoamer, a detergent builder, and deionized water in specific weight proportions. The preparation method involves sequentially dissolving and mixing each component. This invention achieves highly efficient synergistic degreasing and rust removal under weakly acidic conditions. At room temperature, it provides excellent cleaning and corrosion protection for various metal substrates such as steel, aluminum alloys, and galvanized sheets. It is free of strong acids, phosphates, and heavy metals, making it environmentally friendly, safe, low-foaming, and stable. It is particularly suitable for automated spray production lines, comprehensively solving the problem of simultaneously achieving effective cleaning, substrate protection, and environmental protection requirements in existing technologies.

This application relates to a lead-bismuth removal cleaning solution, its preparation method, its application method, and its cleaning system. The lead-bismuth removal cleaning solution provided in this application has low volume fractions of hydrogen peroxide and acetic acid, making it mild and safe. Furthermore, by rationally proportioning the volume fractions of hydrogen peroxide and acetic acid, the solution can accelerate the dissolution of lead and bismuth. Moreover, the weakly acidic nature of the solution can prevent excessive corrosion of the materials being cleaned, thus ensuring their roughness and achieving a good lead-bismuth removal effect.

The application provides a composite plate structure display method, the composite plate is a composite plate of carbon steel and stainless steel, and the method comprises the following steps: surface treatment: after sampling the composite plate, polishing, cleaning and drying are performed on the surface of the sample; primary corrosion: a first corrosion solution composed of hydrogen peroxide, hexamethylenetetramine and water is used for corrosion, and cleaning and drying treatment are performed after the corrosion is completed; activation: an activation solution composed of citric acid and water is used for sample activation, and then cleaning and drying treatment are performed; secondary corrosion: a second corrosion solution composed of alcohol and nitric acid is used for corrosion, and cleaning and drying treatment are performed after the corrosion is completed; structure display: microscopic structure analysis is performed on the sample corroded for the second time under a microscope. The structure display method of the application corrodes the stainless steel and the carbon steel respectively, the carbon steel is not corroded when the stainless steel is corroded, over-corrosion of the carbon steel is avoided, and therefore the stainless steel and the carbon steel can be corroded to the right position respectively.