Aluminium anodizing process 2. Aluminium trichrome passivation (TCP process) 3. Stainless steel passivation proces

Aluminium anodizing process 2. Aluminium trichrome passivation (TCP process) 3. Stainless steel passivation proces Type II anodizing : black coated clear coated, HNi sealing 2. Type III anodizing: clear coated, Hot water sealing Material of work pieces: most are Al6061 (containing Mg and Si as major alloying elements)

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PMAS Training

Process

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PMAS Training Process

2

1 Aluminium anodizing process

2 Aluminium tri-chrome passivation (TCP process)

3 Stainless steel passivation process

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Anodizing Process

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Jigs, Racks and Fixtures

4

Jig material: Aluminium

PMAS work pieces:

1 Type II anodizing : black coated & clear coated, HNi sealing

2 Type III anodizing: clear coated, Hot water sealing

Material of work pieces: most are Al6061 (containing Mg and

Si as major alloying elements)

Al anodizing process

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Full Anodizing process

Mild Alkaline cleaner

Etching additives and scale inhibitors

Nitric acid free Acid Emulsion Desmutting

Anodye series eploxer HNi S

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Time (min) HG.

Tank size (cm) Bath

vol (L)

Tank mat'l water

Agitati on

Exhau st

scrubb er

Rectifi er

Heat/Co oler Filter

1.1 epclen 20N Degreas

Heater SUS2.1 Cascade

-2.2 Cascade

-Al anodizing process

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* Analysis of solution concentration after make –up and periodicity is required

* Analysis procedure is shown in TDS and TA

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Temp ( o C)

Time (min) HG.

vol (L)

Agitati on

Exhaus t

scrubb er

Rectifi er

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From caustic soda etchant reaction

This produces an insoluble precipitate

aluminum hydroxide.

2Al + 2NaOH + 2H 2 O  2NaAlO 2 + 3 H 2

2NaAlO 2 + 4H 2 O  2Al(OH) 3 + 2NaOH

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Etching Al anodizing process

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Etching

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Temp ( o C)

Time (min) HG.

vol (L)

Agitati on

Exhaus t

scrubb er

Rectifi er

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Desmutting Al anodizing process

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Anodizing Process

Type II: Sulfuric anodizing

Sulfuric acid conc.: range between 15-20 v% (150-275 g/l)

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Temp ( o C)

Time (min) HG.

vol (L)

Agitati on

Exhaus t

scrubb er

Rectifi er

5.1-5.4Sulfuric acid

98%

Type II Anodiz ing

5.5 Sulfuric acid

98%

Type III Anodiz ing

0 25-35 1 100 50 85 425 PP DI air ○ ○

100 V

* 1000A

C;PP or PTFE ○

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Chemical parameters: The amount of concentration of sulfuric acid is

determined by two important considerations:

1.) The ability of the solution to conduct electricity efficiently

2.) The ability of the electrolyte to dissolve the aluminum oxide coating

The balance that must be determined and maintained for consistency

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Electrical parameters:

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Temp ( o C)

Time (min) HG.

vol (L)

Agitati on

Exhaus t

scrubb er

Rectifi er

6.4 Sodium

bicarbonate

neutra lizatio n

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Temp ( o C)

Time (min) HG.

vol (L)

Agitati on

Exhaus t

scrubb er

Rectifi er

8.1 Anodye

Black B

Black Dye 55-60 5 1 100 50 85 425 PP DI air ○ ○ H;SUS ○

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Aluminium alloy series

ADC 5, ADC 6 Al, Mg, Mn Good ADC 10, ADC 12 Al, Si, Cu Bad ADC 14 Al, Si, Mg, Cu Bad

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Dyeing Al anodizing process

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Oxide layer thickness

Dyeing

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Temperature control

Dyeing

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Concentration control

Dyeing

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pH control

Dyeing

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Light Fastness

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Dyeing

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Heating & Weather Fastness

Dyeing

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Temp ( o C)

Time (min) HG.

vol (L)

Agitati on

Exhaus t

scrubb er

Rectifi er

9.1 eploxer HNi

S

Hot sealing clear color

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eploxer HNi S: Black coated & Clear coated

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Hot Sealing

Work pieces after anodizing has a sticky feel and highly

absorbent surface that readily stain

Hot sealing is used hot rinse as a dry-off , the following parameters

are significant:

1 Water temp.: the degree of sealing falls rapidly with temperature

2 Sealing time: major part of sealing occurs in the first 5-10 min

3 pH of the water: boehmite will not be formed at pH below 4.5

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Hot Sealing Al anodizing process

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Hot Sealing Al anodizing process

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Quality Measurement

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Coating thickness

Dye stain test

Weight loss test

Sunlight fastness

UV fastness

Heat fastness

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TCP Process

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TCP Process

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Passivation chemical:

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Corrosion testing: Salt Spray test

Exposed time shall be mutually agreed upon btw purchaser and the seller

Quality Measurement

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SUS Passivation Process

Chemical Process Temp (oC) Time (min) HG Tank size Bath volume

(L) Tank Mat'l Water Agitation Exhaust Scrubber

Cascade rinse 1 1 100 70 85 595 PP CW air

Cascade rinse 2 1 100 70 85 595 PP CW air

Cascade rinse 1 1 100 70 85 595 PP DI air

Cascade rinse VI 1 1 100 70 85 595 PP RO air

Hot rinse VI 60-80 1-2 1 100 70 85 595 SUS 304 RO air

Cascade rinse II 1 1 100 70 85 595 PP RO air

Hot rinse II 60-80 1-2 1 100 70 85 595 SUS 304 RO air

Air blow RT Until dry

Oven 80 20-30

Unload 1

40

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SUS Passivation Process

Degreasing

Activation

Passivation

Alkaline cleaner epclen 62

epclen –P12 Acid salt

Type II, Type VI Nitric acid,

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Chemical Process Temp

(oC)

Time (min) HG.

Tank size

Bath volum

e (L)

Tank Mat'l Water

Agitati on

Exhaus t

Scrubb er

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Degreasing SUS passivation process

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Activation SUS passivation process

Chemical Process Temp

(oC)

Time (min) HG.

Tank size

Bath volume (L)

Tank Mat'l Water

Agitati

on Exhaust

Scrubb er

W L H

epclen P12

Activatio

n RT 1-2 1 100 70 85 595 PP RO air o o Cascade

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SUS passivation process

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Passivation SUS passivation process

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Quality Test Method

1 Water Immersion Test

2 High Humidity Test

3 Salt Spray Test

4 Copper Sulfate Test

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SUS passivation process

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Thank you for your attention

Tiêu đề	Aluminium Anodizing Process 2. Aluminium Tri-Chrome Passivation (Tcp Process) 3. Stainless Steel Passivation Process
Trường học	PMAS University
Chuyên ngành	Materials Science
Thể loại	Thesis

Định dạng
Số trang	49
Dung lượng	2,05 MB