Electro-coating bath movement/pulsed voltage and primer thickness

Results of laboratory tests and distributions of thickness primer in the automotive industry indicate that the electro-coating process is only partially inhibited when the required value of thickness primer is achieved. This characteristic imposes to consider all the operating parameters in order to achieve a more constant thickness. The effect of combined electro-coating bath movement/pulsed voltage on primer thickness is detected in this paper by proposing suitable experimental set-up and performing experimental. The obtained results point out the negligible effect of movement on the final paint thickness even when a pulsed voltage was applied. The measured electrical resistance of the film and the sublayer of the partially discharged colloid particles explain the experimentally observed negligible variation.