In electroless nickel plating prior to the ielts preparation jakarta selatan surface pre-treatment include: polishing, degreasing, rust removal, activation and other processes commonly used in electroless nickel plating steel plating pre-treatment methods and the like. The following introduces some of the chemical treatment.
Degreasing methods can be divided into solvent oil, chemical essential oil.
Organic solvent degreasing degreasing is usually characterized by fast, noncorrosive metal, but an intensive degreasing is not ideal for use in chemical or electrochemical methods to add oil, commonly utilized organic solvents: gasoline, kerosene, benzene, ketones some chlorinated paraffins and olefins. Another benefit of organic solvent degreasing or by degreasing solvent can be recycled after use. General can be flammable organic solvents, make use of extra caution.
Chemical degreasing solution is to use saponification and surfactant on the nonsaponifiable oil emulsion, and remove all kinds of oil on the top of. Chemical degreasing temperature is usually used between 60-80 degrees, usually visual artifacts degreasing effect, that surface is completely wetted by water indication of oil completely divisible. In addition to general essential 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 generates oxygen than dual the bubble is little 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 bring about surface area oxidation and dissolution. The most commonly used to exchange positive and negative chemical degreasing technique. Electrochemical and chemical substance degreasing degreasing formula related to formula.
Rust methods include mechanical, chemical substance and electrochemical methods.
Mechanical method is surface corrosion to sand blasting, grinding, polishing roller light or other mechanical treatment, are leveling the top while removing surface rust.
Rust is a chemical remedy 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 process of stripping the part of mechanical removal.
Electrochemical rust is acid or alkaline alternative 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 reaction mechanical stripping the part of bubble removal. Cathode and cathode rust chemical substance precipitation of dissolved hydrogen to remove the function of mechanical peeling.
Pretreatment for electroless nickel plating corrosion rust process simply the same process.
Activation is to enable parts to be completely activated surface, such acid parts for the different materials used in acid differs.
Activation of iron and metal parts generally obtainable 10% sulfuric acid or hydrochloric acid to at least one 1:1, the activation of the standard is generally uniform surface emitting small bubbles. Stainless parts can increase the activation of the acid focus, and heating for etching. Strictly speaking, stainless flash electroless nickel plating should be carried out later on in electroless nickel plating, which is certainly notified within an electrolytic nickel or electrolytic copper bottom.