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Classification and Discrimination of Electroplating Additives

    Electroplating additive refers to the chemical reagent added to the plating solution and is an addition added to the base plating bath to improve the plating bath and various properties of the coatings.Classification of electroplating additives, from the point of view of their nature of starting materials and chemical structure, can be divided into two main groups, inorganic additives and organic additives.It is classified from its principle of action and function, then it can be further divided into brighteners, flatteners, vagus agents, softeners, anti pinhole agents, antioxidants, stabilizers and so on

    Pre treatment of electroplating is a very important flow process, pre-treatment is not done well, and the quality of electroplating is simply not guaranteed.Surfactants, as effective ingredients in plating additives, have been used in electroplating for a number of applications, from their use in cleaning in the early stages of development, to their later wetting, emulsifying and solubilizing effects, among others

    Surfactants have been widely used in plating in addition to their use in pre-treatment for delipidation and in addition to oil treatment.The addition of surfactant to the nickel plating liquor, depending on the combination and purpose of use, can play such roles as brightening, anti pinhole, leveling, stress elimination and impurity inhibition, respectively;In acidic copper plating, polyethylene glycol, polyethyleneimine and various polyoxyethylene type non-ionic surfactants are greatly helpful for expanding the range of the bright zone, improving the deposition capacity of coatings in the current density zone, improving the brightness of coatings and improving the coating quality;Acidic chloride shiny, can be used as a carrier of shiny agents for surfactants with large molecular mass, such as alkylphenols, polyoxyethylene ether and so on;In electroless plating, the adsorption of surfactants on the surface of metal oxide microparticles is beneficial for the co deposition of microparticles with metals in the cathode zone

    In summary, due to the wide variety and complex mechanism of electroplating additives, it leads a lot of enterprises to uniformly classify electroplating additives under the tax code of other chemical works not listed under the tax code 38249099 when classified.But as mentioned before, electroplating additives are in fact a very general concept, in view of the important role played by surfactants in the electroplating industry, it can be said that a considerable proportion of electroplating additives, according to their composition and mechanism of action should be classified under the corresponding suborders 34.02 instead of 38249099.How, then, can a commodity with an plating additive of 34.02 be differentiated

    It is not prudent here to divide the commodities under item 34.02 into two categories.The first category is cleaning agents or deolutinating agents with or without surfactants, and the identification of such commodities can be judged directly by the use of the product without generally having to account for its composition (tax numbers related to"" cleaning agents"" also include 38.10 and 38.14, etc.some classification workers believe that they differ from cleaning agents under 34.02 mainly in their composition,But the author believes that most of the cleaning agents used in electroplating industry belong to the category of 34.02)

    The second category is other surfactants and their products besides detergents and deolutaminants.A surfactant is a macromolecular organic with amphoteric groups that can be judged simply by molecular structure, such as sodium dodecyl sulfate, dodecyl polyoxyethylene ether, aliphatic amine salts, etc., and the surface tension test as defined in Chapter 34 of tax is a strict definition of an organic surfactant under 34.02.Then, the products of surfactants include the above-mentioned mutual mixtures of surfactants, solutions or dispersions of surfactants in one organic solvent, other mixtures with the above surfactants as basic ingredients, soap solutions or dispersions in some organic solvent such as cyclohexanol,But these products do not include products that do not require a surfactant function itself or that the surfactant function plays only a subsidiary role, nor are they water insoluble

source: China Classification network


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