In electroless nickel plating before the metal surface pre-treatment include: polishing, degreasing, rust removal, activation and other procedures ielts preparation di jakarta found in electroless nickel plating steel plating pre-treatment methods and so on. Grinding, polishing, and other physical methods, we do not discuss. The following introduces a few of the chemical treatment.
Degreasing methods can be split into organic solvent oil, chemical oil.
Organic solvent degreasing degreasing can be seen as a fast, noncorrosive metal, but an intensive degreasing is not ideal for use in chemical substance or electrochemical solutions to add oil, commonly used organic : gasoline, kerosene, benzene, ketones some chlorinated paraffins and olefins. Another benefit of organic solvent degreasing or by solvent can be recycled after use. General is flammable organic solvents, make use of extra caution.
Chemical degreasing solution is by using alkaline saponification and surfactant on the non-saponifiable oil emulsion, and remove all sorts of oil on the top of. Chemical degreasing temperature is usually taken in between 60-80 degrees, generally visual artifacts degreasing effect, that surface is totally wetted by water indication of oil completely divisible. In addition to general oil from the NaOH, sodium carbonate, trisodium phosphate, sodium silicate, emulsifiers and other components.
Electrochemical degreasing degreasing cathode and anode sub-degreasing, in the same current, the cathode generates hydrogen degreasing degreasing anode creates oxygen than double the bubble is little and dense, emulsion capacity, oil removal better. But more likely to cause hydrogen embrittlement and impurity in the cathode workpiece precipitation phenomenon. Although there is absolutely no anodic degreasing But these shortcomings may bring about surface area oxidation and dissolution. The most commonly used to exchange negative and positive chemical degreasing method. Electrochemical and chemical degreasing degreasing formula comparable to formula.
Rust methods include mechanical, chemical and electrochemical methods.
Mechanical method is surface rust 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 rust and erosion by chemical result of hydrogen bubbles produced by the procedure of stripping the part of mechanical removal.
Electrochemical rust is acid or alkaline solution on the cathode or anode metal to remove rust treatment. Corrosion is a chemical substance anodic dissolution, electrochemical dissolution and precipitation of the oxygen electrode reaction mechanical stripping the role of bubble removal. Cathode and cathode rust chemical precipitation of dissolved hydrogen to eliminate the role of mechanical peeling.
Pretreatment for electroless nickel plating corrosion rust process simply the same process.
Activation is to enable parts to be fully activated surface, such acid elements for the various 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 standard is normally uniform surface emitting small bubbles. Stainless steel parts can increase the activation of the acid focus, and heating for etching. Strictly speaking, stainless steel flash electroless nickel plating ought to be carried out later in electroless nickel plating, which is definitely notified in an electrolytic nickel or electrolytic copper bottom.