Anodizing Amp-Hour Calculator

Inputs

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Total aluminum area receiving anodic film. Include both sides, inside faces and all parts on the rack.
ft²
Target anodic oxide thickness, not paint or powder film thickness.
mil
Anodizing current per part area. Common shop procedures often specify ASF or A/dm2.
A/ft²
Effective fraction of charge that builds oxide instead of side reactions and dissolution.
%
Approximate anodic alumina film density used to convert target film thickness to oxide mass.
lb/ft³
Linear ramp from zero to target current. Charge delivered during the ramp is included.
min
Available DC current capacity for the rack or tank.
A
Approximate operating voltage used for power and kWh estimates. It does not change the Faraday amp-hour result.
V

Results

Default result
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Required current (I)
1,200 A
Pass

surface area x current density

Also computed

Amp-hours required (Ah) Pass 1,489 A·h

charge adjusted by current efficiency

Total process time (ttotal) Pass 79.43 min

linear ramp plus hold time

Hold time after ramp (thold) 69.43 min

Rectifier utilization (I/Imax) Pass 80.0 %

within entered rectifier capacity

Target rectifier power (P) 24.14 hp

Electrical energy (E) 22.33 kWh

Method notes 3 notes
  • Current = surface area x current density. Amp-hours = total charge / 3600, with charge derated by current efficiency.
  • Oxide charge is estimated from Faraday law for Al2O3 film mass. Oxide density and efficiency should come from shop/process data when available.
  • This is a planning screen, not a process recipe. Alloy, temper, bath chemistry, temperature, agitation, dissolution, rack contact, cathode area, sealing and quality requirements can change the true run time.

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