Inspection Quality of Surface Treatment

PowerPoint Presentation Inspection Quality of Surface Treatment Coating thickness measurement • Fischer Handheld coating thickness gauges 2 Fischer thickness gauge measurement 1 Switch on 2 Select app.

Inspection Quality of Surface Treatment

Coating thickness measurement

• Fischer Handheld coating thickness gauges

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Fischer thickness gauge measurement

1 Switch on

2 Select application file

3 Perform a normalization

-Measure 5 times on the uncoated reference part (base material) and press ENTER key to finish the normalization

4 Calibration

-Place the calibration foil on the uncoated reference part, measure on several point within the foil circle(calibration foil 1), adjust calibration value Repeat calibration steps with calibration foil 2 Press ENTER key to finish

LAB color space describes mathematically all perceivable colors in

the three dimensions

L for lightness

A for color-opponents green-red

B for the color-opponents blue-yellow.

For Black color: focus on “L” value

For non black color: focus on “A, B” value

Quality of sealing measurement

• Dye stain tests: B136 − 84 (Reapproved 2008)E1

Procedure:

1 Apply a drop of HNO3 (40±5 mass%) on test area , 2 min,

temp 25 oC

2 Wash with running water and dry with clean cloth

3 Apply a drop of dye solution, 5 min, temp 25 oC

4 Wash with running water, rub with pumice powder and a

clean cloth wet with water , temp 25 oC

5 Observe dye stain in the test area

• Weight loss test: ISO 3210:2010(E)

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Consists of two methods.

Method 1: Immersion in phosphoric acid/chromic acid solution,

without prior acid treatment  Decorative or protective purposes

Method 2: Immersion in phosphoric acid/chromic acid

solution with prior acid treatment  Architectural purposes

Not applicable for:

⎯ hard coat type which not sealed

⎯ sealed in dichromate solutions

⎯ produced in chromic acid solutions

⎯ undergone hydrophobic treatment

Quality of sealing measurement

- Heat Fastness: 1hr, 200 oC

- Sun light Fastness: ~ 100 hr

- UV Fastness: ISO 6581:2010(E): most colored anodized

finishes will show significant color changes in exposure times

of less than 100 hr

Fastness measurement

Accelerated corrosion testing

• Relating factors:

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Film thickness: Thickness increase, Corrosion resistance

increase

Alloy composition: Inter-metallic particles which are

dissolved in anodizing

Quality of sealing: This is primarily of importance for

retention of appearance

ltems During the test

Concentration of sodium chloride solution 5±1 parts by mass of NaCl

in 95 parts of water

Pressure Of Compressed air kgf/cm 2 (kPa) 0.7 to 1.7 (69 to 167) Quantity Of Spray (ml/80 cm 2 /h) 1.0 to 2.0

Temperature of air saturating container ( °c) 47 ± 2

Temperature of salt water tank ( °c) 35 ± 2

Temperature of test chamber ( °c) 35 ± 2

Accelerated corrosion testing

· Salt spray test: ASTM B117-03

% corrosion = corrosion area(cm) * 100

Total sample area(cm)

Accelerated corrosion testing

NaCl conc Analysis:

1 Pipette sample 10 ml

2 Add DI or RO water 40 ml

3 Drop 3-5 drops of 10% NaCrO4 indicator

4 Titrate with 0.1 AgNO3

Calculation: NaCl = vol of 0.1 AgNO3 * 5.844

· Acetic Acid Salt Spray: ASTM G85 annex A1

Accelerated corrosion testing

ltems During the test

Concentration of sodium chloride solution 5±1 parts by mass of NaCl

in 95 parts of water

Pressure Of Compressed air kgf/cm 2 (kPa) 0.7 to 1.7 (69 to 167) Quantity Of Spray (ml/80 cm 2 /h) 1.0 to 2.0

Temperature of air saturating container ( °c) 47 ± 1

Temperature of salt water tank ( °c) 35 ± 1

· The CASS Test (Copper-Accelerated Acetic Acid-Salt Spray ): ASTM B 368 – 97

Accelerated corrosion testing

ltems During the test

Concentration of sodium chloride solution 5±1 parts by mass of NaCl

in 95 parts of water

Pressure Of Compressed air kgf/cm 2 (kPa) 0.7 to 1.7 (69 to 167)

Quantity Of Spray (ml/80 cm 2 /h) 1.0 to 2.0

Temperature of air saturating container ( °c) 60-65

Temperature of salt water tank ( °c) 49 ± 1

Water Immersion Test

This test is used for the detection of free iron or any other anodic surface contaminants on stainless steel

Procedure:

1 Immerse sample part in a non-rusting tank of distilled

water for 1 hr and allowed to dry in air for 1 hr

2 Repeat this cycle for minimum 12 times

High Humidity Test

This test is used for the detection of free iron or any other anodic

surface contaminants on stainless steel

Procedure:

1 Cleaning sample part by immersion in acetone or methyl alcohol and dry in atmosphere

2 The test shall be performed using humidity cabinet with condition 97±3% at 100±5 oF (38 ±3)oC for minimum of 24 hr

3 The sample part shall not exhibit rust or staining

Copper Sulfate Test

This test is used for the detection of free iron on the surface of

austenitic stainless steel

Procedure:

1 Test solution: Dissolving 4 g of copper sulfate pentahydrate

(CuSO4·5H2O) in 250 ml of distilled water and add 1 ml sulfuric acid (sp.gr 1.84)

2 Swabbing test solution on the surface of the sample, applying additional solution as needed to keep the surface wet for at

least 6 min

3 At the end point, rinsing and drying sample part carefully, not to

Thank you for your attention