ALUMINUM SURFACE FINISHING & ELECTROCHEMISTRY
Anodizing & Electroplating Surface Area & Current Calculator
Compute true wetted 3D surface area from 2D vector part dimensions, calculate 720 Rule amp-minutes, determine required DC rectifier current, and estimate bath immersion time for MIL-A-8625 Type II sulfuric anodizing and Type III hardcoat.
1. Part Geometry & Dimensions
Total combined perimeter of internal holes, slots, and cutouts.
2. Anodizing Class & Coating Spec
Typical: Type II = 10-25 µm (0.4-1.0 mil), Type III = 50 µm (2.0 mils).
Surface Area Metrics
Single Part Area
0.33 sq ft
3.09 dm² / part
Total Batch Wetted Area
3.33 sq ft
30.90 dm² (10 parts)
Rectifier & Bath Electrical Output
Required Rectifier Current
50.0 Amps
At 15.0 ASF current density
720 Rule Amp-Minutes
1417 A·min
Total coulombs required
Tank Immersion Time
28.3 min
For 15.0 µm oxide build
Estimated Heat Generation
3,070 BTU/hr
Chiller cooling load
Process Quality & Tolerance Notes
DIMENSIONAL_GROWTH: +7.5 µm per surface (50% penetration / 50% growth)
HOLE_PINCH: Diameters shrink by ~15.0 µm total
RACKING_ALLOWANCE: Ensure $ge 1$ non-critical contact contact clamping point
HOLE_PINCH: Diameters shrink by ~15.0 µm total
RACKING_ALLOWANCE: Ensure $ge 1$ non-critical contact contact clamping point