The effect of Pigment volume concentration on corrosion protection of new sacrificial coating

Abstract

A new type of sacrificial coating (named SA coating) was developed by adopting anodic pigment of aluminum based alloy powder to make the underlying metal more negative than its corrosion potential. The effects of the Pigment Volume Concentration (PVC) on corrosion protection for the substrate metal were studied by potential monitoring, AC impedance measurement, salt water immersion, and routine tests. Optimum pigment volume concentration range was determined to provide satisfactory corrosion protection and the protective mechanisms were proposed to explain the experimental results.Ein neuer Typ von galvanisch wirkender Beschichtung (SA Beschichtung) wurde auf der Basis eines anodischen Pigments aus einem Aluminiumlegierungspulver entwickelt, wobei das Potential des darunterliegenden Metalls unterhalb seines freien Korrosionspotentials verschoben wird. Der EinfluS der Pigmentvolumenkonzentration (PVC) auf den Korrosionsschutz des Substratmetalls wurde mittels Potentialmessung, AC Impedanzmessung, Salzwassertauchversuchen und Routinetests untersucht. Urn einen ausreichenden Korrosionsschutz zu gewahrleisten, wurde ein optimaler Bereich der Volumenkonzentration des Pigments ermittelt. Schutzmechanismen, die die experimentellen Ergebnisse erklaren, werden vorgeschlagen.

Electrochemical Impedance Spectroscopy Study of Waterborne Epoxy Coating Film Formation

“…The number of published studies on using EIS for investigating the effects of PVC is relatively small. Most of these studies [16][17][18][19][20][21] were carried out on alkyd, epoxy and other solvent borne-based coatings. Furthermore, there are only a few reports about the use of EIS to study PVC in waterborne coatings [4,22].…”

Research and Development on the Antiaging Polymer Coatings

“…When closing the chelate ring, ultraviolet energy could be released in the form of other harmless way. The energy of opening loop was higher, the less they could transmit into the polymer coating [21] . Macromolecular compounds could absorb ultraviolet light energy to quenching agent.…”