January 22, 2008

Operating Condition of Electropolishing

The below are the solution and operating Condition for Electropolishing Aluminum.

No.

Composition

Wt

(%)

Anodic Current Density

(A/sq.ft)

Voltage

(Volt)

Temperature

( 0C )

Treatment Period

(min)

1

Orthophosporic Acid

Sulphuric Acid

Chromic Acid

Water

65

15

6

14

200 - 250

12 - 15

70 - 80

2 - 5

2

Orthophosporic Acid

Sulphuric Acid

Chromic Acid

Water

43

43

3

11

300 - 500

12-15

70 - 80

2 - 5

3

Orthophosporic Acid

Sulphuric Acid

Chromic Acid

Water

36

36

4

24

200 - 400

12 - 15

70 -90

1 – 5

4

Orthophosporic Acid

Chromic Acid

Water

82

12

6

209 - 400

12 - 15

70 - 80

5 – 8

5

Trisodium Phosphate

Soda Ash

5

15

30 - 60

12 - 15

80 - 90

5 – 8

6

Hydrofluoboric Acid

1.25

15 - 30

20 - 30

30

10 - 20

see other metal coating method: Preparation for metal coating

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