CADMIUM PLATE – APTICOTE 900
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.
Options
apticote 900N
Normal, bright cadmium
plate
apticote 900L
A lower embrittlement,
duller cadmium plate
CADMIUM PLATE
Apticote 900
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.
Low friction
Coefficient of friction as low as 0.15 vs steel allows for routine inspections through disassembly causes very little wear on parts.
Ductile, self-healing
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.
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