STRUCTURAL MAPPING OF HYBRID METAL PHOSPHONATE CORROSION INHIBITING THIN FILMS

Abstract

The constant growth in the area of metal phosphonate materials is exemplified with rich chemistry and a variety of applications. From the multitude of subjects related to metal phosphonates, we have decided to focus on metal phosphonate coordination polymers as corrosion inhibitors in the present Comment. A plethora of metal phosphonate organic-inorganic polymeric hybrid materials have been synthesized, structurally characterized, and evaluated for their anticorrosion properties for the protection of carbon steels. These materials are composed of a metal ion (usually Zn²⁺, Ca²⁺, Sr²⁺, Ba²⁺, etc.) and polyphosphonate ligands such as AMP (amino-tris(methylenephosphonate) and HDTMP (hexamethylenediamine-tetrakis(methylenephosphonate), or carboxyphosphonate ligands, such as PBTC (2-phosphonobutane-1,2,4-tricarboxylate) and HPAA (hydroxyphosphonoacetate). Their corrosion inhibition performance has been evaluated and some interesting conclusions are drawn relating molecular structure to inhibitory activity.

Keywords:

• frameworks
• hybrids
• inhibition
• metal phosphonates corrosion
• MOF