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)
1,200A
Pass

surface area x current density

Also computed

Amp-hours required(Ah)Pass1,489A·h

charge adjusted by current efficiency

Total process time(ttotal)Pass79.43min

linear ramp plus hold time

Hold time after ramp(thold)69.43min

Rectifier utilization(I/Imax)Pass80.0%

within entered rectifier capacity

Target rectifier power(P)24.14hp

Electrical energy(E)22.33kWh

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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