Technical-functional electroplating treatments aim to change the surface properties of the substrate by electrochemical deposition of a thin layer of a metal or alloy, such as on: iron and iron alloy, copper and copper alloys, brass and stainless steel.
Tin coatings are valued mainly for their protective value in the face of weathering and various substances, including foodstuffs, and for its high electrical conductivity and weldability qualities. Electrolytic tinning is noted not only for its pronounced penetrating power but also for its property of acting as a degreasing bath.
Copper plating occupies an important place in the industrial cycles of ferrous material production. It is mainly used as an intermediate layer in nickel plating, silver plating, gold plating etc. of aluminum and its alloys, zinc and its alloys.
In copper plating processes we use copper and sulfuric acid baths especially in thick plating due to the use of higher current densities.
Galvanic silver plating in addition to being used for decorative purposes is also used in electrical engineering to aid electrical contacts and in thickness plating for motor parts.
We perform shiny and matte-satin silvering. In the former case, an additional finishing operation is required after leaving the silvering baths to give a shiny or matte-satin appearance. Polished silvering produces directly polished deposits. Since common silvering baths produce dull, soft coatings they need further brightening resulting in loss of metal through abrasion and the use of cleaning agents. For this reason, efforts have been made to make baths-basics, including Wood’s bath capable of accommodating splendogens-to achieve immediate shiny silvering.
SILVER PLATING OF ELECTRIC CONTACTS IN COPPER BEFORE AND AFTER
SILVER PLATING OF ELECTRIC CONTACTS IN COPPER BEFORE AND AFTER
Immersion baths are used for silvering on ferrous material, on copper, and on brass; silvering is carried out following immersion in the solutions. Concentrate baths, on the other hand, accomplish what is known as strong silvering, that is, silvering at significant thickness.
Gold is by nature softer than silver, but in combination with silver or nickel it increases strength. In addition to being used for the purpose of ennobling ornamental objects, gold plating is also used in industries of other kinds, such as those pertaining to electrical contacts, semiconductors, rectifiers, vacuum tubes, electronic components, etc.
Gold plating is a treatment mainly used in the electrolytic industry because it provides greater resistance to corrosion and promotes its conduction.
The treatment of parts begins with a preliminary cleaning of the and alkaline degreasing. To ensure greater durability to abrasion, handling and atmosphere and to prevent the occurrence of staining, the surface is coated with an intermediate layer of nickel before and after copper plating. To finish, the piece is dried and finished with gilding.
SELECTIVE
TREATMENT
Selective treatments can be made by pad and/or masking technique.
Coating thickness can be flash or with a deposit of several microns, for gold plating, silver plating, tin plating, copper plating and nickel plating treatments.
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