Cadmium Plate –
Apticote 900 is an electrolytic process that can deposit protective cadmium coatings on to a variety of base materials to produce a degree of corrosion protection unmatched by other sacrificial coating systems. Cadmium out-performs coatings based on zinc or aluminium in aggressive corrosion situations, including atmospheric, saline and alkaline conditions.
Cadmium provides corrosion protection by its unique ‘sacrificial’ action. When applied as a coating on steels or other structural metals, it corrodes preferentially and the substrate remains undamaged, even if the cadmium is scratched. Normally, the cadmium coating is applied with a thickness between 5 and 25μm and its own corrosion rate is less than one fiftieth of that of steel.
Normal, bright cadmium
A lower embrittlement,
duller cadmium plate
Superb corrosion protection to key components
Cadmium plate acts as a sacrificial coating, corroding before the substrate and has been proven to provide over 2,000 hours salt spray protection. Cadmium corrodes at a predictable slow rate – up to one-fiftieth that of bare steel.
Coefficient of friction as low as 0.15 vs steel allows for routine inspections through disassembly causes very little wear on parts.
Cadmium plating continues to provide corrosion protection even when the surface is scratched.
Small volume growth when oxidising
Lower than zinc or aluminium coatings.
No final grinding
A smooth and aesthetically pleasing surface is achieved as plated removing the need for any final grinding.
Prevents galvanic corrosion between steel fasteners and aluminium
Reduces tightening torque of fasteners and allows repeat dismantling
Prevents jamming of fasteners or delicate mechanisms
Accommodates manufacturing tolerances without finishing
Helps guarantee safety of highly stressed parts
After electroplating and heat-treatment (if required), a chromate conversion coating is usually applied, giving the coating its well-known iridescent green/brown appearance. Such a treatment can double the corrosion resistance. A thin conversion coating can maintain a bright as-plated finish and does not appreciably affect the electrical conductivity of the surface, nor its solderability. A clear lacquer coating can provide additional protection.