U.P.B. Sci. Bull., Series B, Vol. 78, Iss. 2, 2016 ISSN 1454-2331 PHENOLATED METHYLOLEATE-BASED POLY(BENZOXAZINE) FILMS AS CORROSION PROTECTION LAYERS ON Zn/Mg/Al-ALLOY COATED STEEL Corina ANDRONESCU 1 , Brindusa BALANUCA 2 , Matei RAICOPOL 3 Three phenolated methyloleate-based benzoxazine derivatives were spincoated on or spraycoated on Zn-Mg-Al alloy coated steel surfaces. Upon heat- curing under formation of the corresponding poly(benzoxazine) films, their corrosion protection properties were investigated using longterm open-circuit potential (OCP) measurements, SEM imaging and EDX elemental analysis, before and after the OCP measurement in chloride-containing electrolyte. The influence of the poly(benzoxazine) film thickness on the corrosion protection of Zn-Mg-Al alloy coated steel was investigated using an automatic scanning droplet cell and sequential potentiodynamic polarization curves. Keywords: phenolated methyloleate; benzoxazine derivatives; poly(benzoxazine); corrosion protection; Zn-Mg-Al alloy coated steel; scanning droplet cell 1. Introduction Coating of metal surfaces with polymer films is a commonly applied stra- tegy for passive corrosion protection [1]. The polymer layers are considered to prevent the access of water and ions to the metal surface by creating a physical barrier, thus substantially decreasing the anodic reaction, and hence, the overall corrosion currents [2]. Poly(benzoxazines) are a class of polymers which exhibits a number of interesting properties such as low water absorption and almost no shrinkage upon curing [3]. These properties make poly(benzoxazines) good can- didates for anticorrosion coatings. Despite these extraordinary properties, only little attention was devoted to the application of poly(benzoxazine) films as anticorrosion coatings [4-8]. Moreover, recent reports demonstrated that benzoxa- zine monomers can be derived from bio-based resources, starting e.g. from euge- 1 Bioresources and Polymer Science Department. University POLITEHNICA of Bucharest, Romania, e-mail: corinaandronescu@yahoo.com 2 Bioresources and Polymer Science Department, University POLITEHNICA of Bucharest, Romania 3 Organic Chemistry Department. University POLITEHNICA of Bucharest, Romania, e-mail: matei_raicopol@yahoo.com