02608nas a2200253   4500008004100000022001400041245013800055210006900193260000900262300001100271490000800282520169600290653001901986653002502005653001602030653001402046653002802060100002902088700002902117700002702146700002902173700002602202856012602228       2022                        eng d  a0927-775700aFree base phthalocyanine coating as a superior corrosion inhibitor for copper surfaces: a combined experimental and theoretical study0 aFree base phthalocyanine coating as a superior corrosion inhibit  cSEP   a1291380 v6483 a<p>
	In the quest of novel, eco-benign copper corrosion inhibitors, free base and a set of six metal Phthalocyanine (Pc) coatings (where metal is Zn, Cu, Fe, Co, Ni, Mn) are systematically evaluated for their corrosion inhibition efficiency. The study demonstrates that the free base Phthalocyanine coatings are superior corrosion inhibitors for Cu surface in HCl with a corrosion inhibition efficiency of 88% as compared to its metal counterparts. A detailed and indepth study involving concerted electrochemical polarisation, impedance measurements at various concentrations of HCl assert the superior corrosion inhibition efficiency of free base Pc coatings as compared to its metal counterparts. Underlying factors/interface chemistry contributing to it is brought out using first principle based studies. First principles based computational studies establish that superior corrosion inhibition ability of free base phthalocyanine molecule is attributed to its innate binding ability with copper surface and its better inter-molecular packing. Thus, the theoretical adsorption trends of various studied phthalocyanine molecules while clearly following the experimental corrosion inhibition efficiency trends undermine the importance of contribution of chelating factors for the formation of a stable and efficient corrosion inhibition coating on a surface and that the adhesion/adsorption strength of a molecule correlates directly to its corrosion inhibition efficiency. The experimental observations are further substantiated through FE-SEM, EDAX and XPS studies. The corrosion inhibition efficiency of free base phthalocyanine is followed by its zinc based counterpart at 85%.</p>
10aCopper surface10aCorrosion inhibitors10aDFT studies10aImpedance10aPhthalocyanine coatings1 aSamal, Pragnya, Paramita1 aDekshinamoorthy, Amuthan1 aArunachalam, Shivakami1 aVijayaraghavan, Saranyan1 aKrishnamurty, Sailaja  uhttps://library.ncl.res.in/content/free-base-phthalocyanine-coating-superior-corrosion-inhibitor-copper-surfaces-combined