In electroless nickel plating prior to the metal surface area ielts preparation jakarta selatan include: polishing, degreasing, rust removal, activation and other procedures commonly found in electroless nickel plating metallic plating pre-treatment methods and so on. The following introduces a few of the chemical treatment.
Degreasing methods can be divided into organic solvent oil, chemical oil.
Organic solvent degreasing degreasing can be characterized by fast, noncorrosive metal, but a thorough degreasing is not ideal for use in chemical or electrochemical solutions to add oil, commonly used organic solvents: gasoline, kerosene, , ketones some chlorinated paraffins and olefins. Another advantage of organic solvent degreasing or by degreasing solvent could be recycled after use. General can be flammable organic solvents, make use of extra caution.
Chemical degreasing solution is to use alkaline saponification and surfactant on the nonsaponifiable oil emulsion, and remove all sorts of oil on the surface of. Chemical degreasing temperature is normally taken in between 60-80 degrees, usually visual artifacts degreasing effect, that surface is completely wetted by water sign of oil completely divisible. Furthermore to general oil from the NaOH, sodium carbonate, trisodium phosphate, sodium silicate, emulsifiers and other components.
Electrochemical degreasing degreasing cathode and anode , in the same current, the cathode produces hydrogen degreasing degreasing anode produces oxygen than double the bubble is small and dense, emulsion capacity, essential oil removal better. But likely to trigger hydrogen embrittlement and impurity in the cathode workpiece precipitation phenomenon. Although there is absolutely no anodic degreasing But these shortcomings may result in surface oxidation and dissolution. The most commonly used to exchange negative and positive chemical degreasing technique. Electrochemical and chemical substance degreasing degreasing formula equivalent to formula.
Rust methods include mechanical, chemical substance and electrochemical methods.
Mechanical method is surface corrosion to sand blasting, grinding, polishing roller light or additional mechanical treatment, are leveling the top while removing surface rust.
Rust is a chemical solution with acid or alkali to strong erosion of the metal surface treatment to products corrosion and erosion by chemical result of hydrogen bubbles produced by the procedure of stripping the function of mechanical removal.
Electrochemical rust is acid or alkaline remedy on the cathode or anode metal to remove rust treatment. Rust is a chemical substance anodic dissolution, electrochemical dissolution and precipitation of the oxygen electrode response mechanical stripping the role of bubble removal. Cathode and cathode corrosion chemical substance precipitation of dissolved hydrogen to remove the role of mechanical peeling.
Pretreatment for electroless nickel plating corrosion rust process simply the same process.
Activation is to allow parts to be fully activated surface, such acid elements for the different materials used in acid is different.
Activation of iron and metal parts generally available 10% sulfuric acid or hydrochloric acid to at least one 1:1, the activation of the typical is normally uniform surface emitting tiny bubbles. Stainless parts can raise the activation of the acid focus, and heating for etching. Strictly speaking, stainless steel flash electroless nickel plating should be carried out afterwards in electroless nickel plating, which is definitely notified in an electrolytic nickel or electrolytic copper bottom.