Corrosion and cathodic disbondment resistance of epoxy coating on zinc phosphate conversion coating containing Ni 2+ and Co 2+

Corrosion Behaviour of Preserved PEO Coating on AZ31 Magnesium Alloy

“…where n accounts for non-ideal behaviours: when it equals to 1, the CPE is a pure capacitance and when it equals zero, the CPE is a pure resistance. The CPE c is a suitable parameter to show the amount of penetration of water into the coating, while the CPE dl indicates the capability of the adhesive bond failure and penetration of electrolyte to the interface of coating/metal [30]. The corrosion tests were performed in a simulated neutral salt spray atmosphere according to STN EN ISO 9227 standard in Votsch VSC KWT 1000 corrosion chamber.…”

“…After 4 weeks of exposure, more than 90 % of the sample was already covered with corrosion products, which means that charges transfer through the electrode surface (or metal / electrolyte interface in our case) [26]. It is an appropriate parameter to evaluate the corrosion in the beneath coating and separation of coating from the metal substrate [30]. Generally, high values of the charge transfer resistance and low values of double layer capacitance signify a coating of better performance [39].…”

Microstructural characterization and film-forming mechanism of a phosphate chemical conversion ceramic coating prepared on the surface of 2A12 aluminum alloy

“…Shanmugam et al 1 reported that the growth mechanism of iron-manganese phosphate composite coatings formed on the aluminum surface was dissolution of Al and a subsequent deposition of coating. Golabadi et al 43 demonstrated that Ni 2+ and Co 2+ could increase the corrosion resistance of the phosphate coating. Nevertheless, although chemical conversion coating has been investigated for many years, the phosphate conversion coating with excellent microstructure, corrosion resistance and high temperature resistance has not been reported to date.…”

Diglycidyl ether of bisphenol A/chitosan‐graft‐polyaniline composites with electromagnetic interference shielding properties: Synthesis, characterization, and curing kinetics

“…Epoxy resins (ERs) are thermosetting substances, which have been extensively used in many industrial fields as coatings and adhesives , composites , electronics , and so on. These wide applications are stemmed from the excellent mechanical, thermal, and adhesion properties of ERs .…”