Standardised testing procedures ensure that all statements about the quality of the coatings are reliable and can always be compared.
Test methods for quality assurance
*Function of test conditions
Determining the coating thickness using a spherical abrasion test
In this measuring technique, a spherical indentation is abraded in the coated substrate with a steel ball. The resulting indentation is measured and the results are used to calculate the coating thickness.
Coating thickness measurement from spherical abrasion test
Adhesion testing with a Rockwell test
A conventional Rockwell hardness test (DIN 50103) is carried out and the network of coating cracks and flaking around the edges of the indentation is analysed using an optical microscope. The adhesion of the coating is assigned in one of six adhesion classes.
Coating adhesion test using Rockwell indentation
Determination of the coating hardness by micro-hardness testing
The diagonals of an impression made by the test solid under a defined load are measured with an optical microscope. The coating hardness is calculated from the length of the diagonals, D (in mm), and the load, F (in N).
Determination of the coating hardness by micro-hardness testing
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