Coulometric measuring method

The coulometric method may measure which coating- substrate combinations?

It measures electrically conducting metal coatings on metals or on plastics or on ceramics.

Which requirements must be fulfilled ahead of the coulometric measurement?

The following must apply: A clean coating surface, a good contact of the stand clamp to the specimen. Further one should choose a de-plating speed about as large as the relevant coating thickness. It is also important to pick the correct  electrolyte.

Which factors determine the accuracy of the measurement for the coulometric method?

These factors are: coating thickness, surface composition, the applied measuring cell gasket, de-plating speed and the purity of the coating.

Does the factor 'density' play a role for the calibration?

Yes, this is the case.
Example:
At first the measurement instrument is calibrated with a sample and its coating's density has 2 g/cm³. Then a new sample shall be measured with a coating's density of 1 g/cm³. Without any new calibration a systematic measuring error will then occur. This means the measuring values would always be too small. This is the case, because the instrument rates the measuring signals of the new sample in such a manner, as if the coating's density also was 2 g/cm³.

Your contact to FISCHER

Contact

Partner of Industrial Segments
Sigma Enterprises WLL
PO Box 15784, Alfardan Center, Grand Hamad Street, Doha
Phone: +974 44622614
E-Mail: Manuel.Ramalho@sep.qa
Online contact form

Partner of Jewelry Segment
Qatar Scientific Co WLL
PO Box 41243, Office # 511, 5th Floor Al Retaj Business Center, Rawdat Al-Khail Area B-Ring Road, Doha
Phone: +974 4462 1165
E-Mail: afifi@qsneoscience.com
Online contact form