Coating Testing of Metal Materials-NG28

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Home > Our Services > Raw Material & Fuel Chemicals > Testing > Metal Materials > Service Details

Coating Testing of Metal Materials

The product will inevitably be affected by the environment or other objects during transportation or use, resulting in partial functional failure of metal workpiece, such as oxidation, wear, corrosion, etc. Therefore, the quality of the coating layer has a vital influence on the surface performance of the product, and the quality of the coating can be effectively improved through the control of the coating quality. NG28 China Testing can provide a series of tests for the coating of metal workpiece to help customers identify the quality of the coating and improve the service life of the product.

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? Service Background

1. Want to know the quality of the product coating;

2. Want to improve coating technology and process;

3. Want to improve the surface performance of the product;

4. Want to extend the service life of the product.

? Service Content

1. Routine test items

Coating thickness test	Coating thickness(metallographic method), coating thickness (XRF), coating thickness, anodized film thickness, anodized electrophoretic paint composite film, thickness of anodic oxide coatings for aluminium and its alloys(mass)
Coating weight test	Conversion coatings mass test, zinc Coating、aluminium-zinc coating mass test, seal quality of anodic oxide coatings for aluminium and its alloy
Adhesion test	adhesion test:Thermal shock, adhesion test:scribe-grid, adhesion test:bend
Coating related tests	Coating surface morphology, coating structure analysis, coating composition(surface), coating composition(cross section), coating composition(chemical methods), chromium coating crack, pore number, gold-plated layer porosity , the coating porosity

2. Adaptive range of product

It is suitable for metal materials and their products, including steel, aluminum alloy, profiles, fasteners, auto parts, mechanical equipment and parts, etc.

3. Routine sample requirements

Coating thickness(metallographic method), coating thickness, anodized film thickness, anodized electrophoretic paint composite film	Cut cross section
Coating thickness (XRF)	1. The height of the test sample shall not be greater than 13 cm, and the specific test position shall be specified, and the test plane of the sample shall be greater than 0.4 mm; 2. Need to provide sample plating process.
Thickness of anodic oxide coatings for aluminium and its alloys(mass)	1. Surface area 800~1000mm² 2. Mass ≤100g
Conversion coatings Mass test	1. The mass of the test piece ≤200g 2. Surface area requirements: m_A unit film weight m_A＜1g/m², S≥400cm² 1~10g/m², S≥400cm² 10~25g/m², S≥100cm² 25~50g/m², S≥50cm² ＞50g/m², S≥25cm²
Zinc Coating、aluminium-zinc coating mass test	1. Suggestion: plate sample 60*60mm,3pcs 2. The single side area of plate is 3000~5000mm² Steel wire Ф (0.15-0.8)，L=600mm (0.8-1.5)， L=500mm (＞1.5)， L=300mm 3. Others, total area＞2000m²
seal quality of anodic oxide coatings for aluminium and its alloy	Surface area≥5000mm², about 10000mm², 100*100mm is recommended
Adhesion test	1. scribe-grid: ≥100*100mm 2. bend: L≥200mm
Coating surface morphology, coating structure analysis, coating composition(surface), coating composition(cross section)	The surface does not contain moisture and has no magnetic sample
gold-plated layer porosity	The gold coating of the sample should be greater than 0.25μm
the coating porosity	Method 1: Nitric acid vapor method, suitable for gold plating, the thickness of the gold plating should be less than 0.75μm; Method 2: Sulfur dioxide or sulfurous acid method, suitable for gold-plated layer, tin-plated layer, titanium-plated layer, palladium-nickel layer, the thickness of the plating layer should be greater than 0.38μm。
coating composition(chemical methods)	20g, the sample surface is flat