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#140 Physical Properties of Functional Plating

Category : Electroplating
November30, 2012

Physical properties of functional plating are as follows.

Required characteristicsPlating typeApplication examples
SolderabilityTin, Tin-Lead alloy, Silver, Copper, Nickel, Electroless nickel, CadmiumElectronic parts, Semiconductor parts, Electrical parts
BondabilityGold, Silver, Copper, Electroless nickelElectronic parts, Semiconductor parts
PorosityIndustrial chromeInternal combustion engine (Cylinders, Piston rings, etc.)
Non-adhesivenessDispersion nickel, Industrial chromeMolds
Adhesiveness/
Coating adhesiveness
Brass, Copper, Zinc chromate, Dispersion platingSteel wire, Paint base coats

(1) Solderability

This is regarding how well solder bonds with two metal surfaces, and it describes solder affinity and the wetness of solder. This characteristic is indispensable to electronic, semiconductor, electrical and machine parts that require soldering.

(2) Bondability

Connecting the electrodes of semiconductor devices to lead frames is called Bonding. Gold and aluminum wires are typically used for these connections, and how well the connections are made is called Bondability. The characteristics required for the plating are layer softness, surface cleanliness, heat adhesiveness. Gold, silver, electroless nickel platings are used. Fig

(3) Porosity

This is a characteristic of having many minute pores on surfaces where lubricants can be retained. Lubricity is extremely important for the pistons and cylinders of internal combustion engines, and porous industrial chrome satisfies that purpose.

(4) Non-adhesiveness

This means as same as mold releasing ability where objects do not adhere to things. This at the same time relates to low friction coefficient and sliding characteristics. Conventionally, mold releasing compounds were used on rubber and plastic molds in order to promote de-molding of workpieces, but application of dispersion plating with good non-adhesive characteristic enabled molding processes without the mold releasing compounds.

(5) Adhesiveness/Coating adhesiveness

This is a property to improve adhesion quality of metals and organic polymeric materials such as paints, linings, and composite material formations. With automotive radial tires, steel wires are dual layer plated with copper and zinc, then heat treated to be dispersed in order to improve the adhesion with rubber.

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