Application background and overview of stannous fluoroborate
Stannous fluoroborate is easily soluble and can use high current density. It is usually used for rapid tin plating and is suitable for continuous and rapid tin plating of plates, strips, and wires. The most commonly used additives for stannous fluoroborate systems are mainly β-naphthol and diphenol (antioxidant). Adding β-naphthol can improve cathodic polarization. Adding antioxidants can help prevent the oxidation of tin ions. In order to To obtain fine-grained bright coatings and improve the corrosion resistance of electroplated tin plates, special additives for this system must also be developed. The nucleation and growth mechanism of electrodeposition has a very significant impact on the structure and phase composition of the coating, which further affects the corrosion resistance and usage conditions of the coating. Therefore, it is of extremely important practical significance to develop new stannous fluoroborate electroplating additives and improve the corrosion resistance of electroplated tin plates.
Application structure of stannous fluoroborate
Applications of stannous fluoroborate
Stannous fluoroborate is used in grain products to prevent erosion by organic acids, and is also used in the electroplating industry. It is produced by the reaction of metallic tin and fluoroboric acid under certain conditions. The aqueous solution contains a certain amount of free acid and is acidic. Examples of its application are as follows:
1. Prepare an electrolyte for tin plating of metal copper wires, consisting of the following components and mass ratios: stannous fluoroborate: 35-38g/L, fluoroboric acid: 90-95g/L, ethylene glycol : 3-4g/L, hydrogen elimination agent: 0.4-0.6g/L, catechol: 0.5-0.7g/L, alcohol: 6-8mL/L, formaldehyde: 4-6mL/L, antioxidant: 2- 3g/L, brightener: 6-8g/L. The above-mentioned electrolyte has fast precipitation speed, wide current density range, low power consumption, high solution temperature, and after electroplating treatment, the coating is fine, white and shiny, easy to maintain, low cost, and has a wide range of applications.
2. It is used for copper wire tin plating, which includes three processes: copper wire plating pre-treatment, copper wire electroplating and copper wire post-plating treatment. The difference from the existing technology is that in the copper wire electroplating process, the electroplating solution It consists of stannous fluoroborate, lead fluoroborate, fluoroboric acid, boric acid, catechol, combined brightener and water. The lead-tin ratio of the anode used in electroplating is reasonable. The tinned copper wire produced is uniform in color, smooth and clean, without exposed copper or rust, and will not fade when heated to 200°C for 5 minutes.
3. For preparing a lithium-ion battery negative electrode material, the preparation method includes: preparing a modification liquid mixed with a carbon substrate, and subjecting the carbon substrate to a mixing process to form a modified liquid. The modified carbon substrate is then placed in a non-oxidizing gas atmosphere for a drying process to obtain the lithium ion battery negative electrode material; the modification liquid contains a polar solvent and a fluoroboric acid A first component of tin, fluoboric acid, and thiourea, or a second component having stannous chloride, potassium citrate, and at least one of the following alkali agents: potassium hydroxide, lithium hydroxide, and sodium hydroxide ; The product of the method of the present invention has fast preparation speed, high safety and simple steps, and the present invention also provides a lithium ion battery negative electrode material whose atomic number ratio of sulfur to tin in the attachment material is between 0.8 and 1.2. .
4. Used to prepare an environmentally friendly blackened mirror gloss-enhancing corrosion resistant agent, which is made of the following raw materials in parts by weight: 15-25 parts of copper sulfate, 30-50 parts of hydroxypyridine metastannate, fluoroborate 5-10 parts of tin, 2-5 parts of stannous acetate, 5-15 parts of sodium thiosulfate, 15-25 parts of tin disulfide, 15-25 parts of sodium stannate, 5-15 parts of nickel sulfate, 5 parts of potassium citrate -15 parts, 300-parts of water. This environmentally friendly blackening mirror gloss-enhancing corrosion-resistant agent does not need to be soaked in dehydrated anti-rust oil after blackening treatment, and can be stored in the natural environment for 6 months without rusting.
5. Used to prepare a ternary alloy layer on aluminum-silicon alloy. It is prepared by degreasing, etching, zinc immersion, nickel plating, activation, ternary plating and other steps. After nickel plating, use 40~ 50 g/L fluoroboric acid solution is activated, and then ternary plating is performed: the plating solution contains 90~120 g/L lead fluoroborate, 8~18 g/L stannous fluoroborate, and 2~3 g/L copper fluoroborate. liter, fluoroboric acid 70~120g/L, resorcin 5~10g/L, gelatin 5~10g/L, plating temperature 20~25℃, current 1.5~2.5A/ dm2, the anode is lead-tin anode.
In the present invention, aluminum is treated through certain stepsThe surface of the silicon alloy is treated and activated, and then a ternary alloy layer is electroplated on the aluminum-silicon alloy layer, which solves the difficulty of combining the aluminum-silicon alloy with the ternary coating, improves the surface properties of the aluminum-silicon alloy layer, and expands its scope of application , used to prepare bearing bushes, its load-bearing capacity can reach the same load-bearing capacity as copper-lead ternary plating materials (up to more than 50MPa), and because aluminum is cheaper than copper, the cost of the base material is reduced by more than 50%.
6. Used to prepare a bending-resistant nylon material for cable sheathing, which is made of the following raw materials by weight: nylon 11-30-45, thermoplastic polyurethane elastomer-23-36, styrene-isoprene Diene-butadiene terpolymer-15-25, nanodiamond-18-26, basic sodium aluminum carbonate-10-15, brominated epoxy resin-17-24, isocetyl palmitate- 3-6, N,N-dimethyl-p-toluenesulfonamide-5-10, tris(butoxyethyl)phosphate-8-14, magnesium oleate 3-5, stannous fluoroborate 2-4, Barium molybdate 4-8, aramid pulp-10-15, additives 2.5-4.5. The present invention uses nylon 11 as the main material, and adds thermoplastic polyurethane elastomer and styrene-isoprene-butadiene terpolymer to blend and modify aluminum magnesium carbonate to improve its bending resistance and fatigue resistance. sex.
