Patent ID: 9606048
Date: 2017-03-28
CPC Classifications: G01B,G01G,G01N

Claim:
1. A method for measuring the passivation coating composition weight per unit area on a metal substrate comprising the steps of: (i) applying a passivation coating composition to a metal substrate to obtain a passivation coating composition on the metal substrate; (ii) measuring a Fourier Transform Infrared energy spectrum of the passivation coating composition on the metal substrate of step (i) by obtaining the FTIR spectrum and integrating the spectrum associated with at least one functional group to yield an integral of the absorbances; (iii) obtaining a calibration standard using a Fourier Transform Infrared energy spectrum for a series of calibration samples having different predetermined weights of the passivation coating composition on the metal substrates by (iv) calculating the passivation coating composition weight per unit area on the metal substrate using the calibration standard of step (iii) and integral of absorbances from step (ii).