Techniques for assessing the protective properties of chromated conversion coatings—Part I: Aluminum

The Role of Coating Defects and Substrate Heterogeneities in the Long-Term Performance of Painted Aluminum Alloys

“…This is similar to what is seen for ORR on metals in sea water with calcareous deposits. 66 Thus, 0 2 reduction is hampered and limited by the pores and cracks «lengths in the CCC, which limit reduction in boundary layer thickness. While it could be argued that the "ETR barrier effect" of the CCC could also account for this observation, the role of the CCC as a barrier to hydrodynamically aided diffusive transport of 0 2 to the I surface below CCC cannot be ruled out.…”

“…It is tempting to eliminate the right-hand second term by conducting experiments at fast scan rate to freeze-in or fix the coverages. 66 However, the lower impedance of the C dl and adsorption C 6 at high frequency may complicate measurements by switching capacitive currents into CORROSION-Vol. 56, No.…”

“…R" should be used in the Stern approximation if Tafel slopes under charge-transfer-controlled conditions are utilized. 66 In some cases, effects of inhibitor concentration on iron corrosion rate were best assessed using R. t as opposed to Rp.…”

Corrosion Protection of Aluminum Alloy by Sol-Gel Derived Organic-Inorganic Hybrid Pretreatments Based on Epoxy Resin Modified Silane Precursor

“…Typically these multi-layer protective coating systems include a conversion pretreatment that is applied directly on the bare metal surface followed by a primer, and a top coat. The most common and effective pretreatments used in such protective systems is chromatebased conversion coatings (pretreatments) (CCC) [3,4]. The CCC provides corrosion resistance and good foundation for adhesion of subsequent organic coatings, such as primer.…”