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Formation and stability of protective films of phosphonic acid on various metal substrates

Corrosion is a natural phenomenon that causes great economic and environmental losses. Although many corrosion protection systems are present on the market, there is still a great need for environmentally and economically acceptable protective solutions. One of the possible solutions is application of thin, well-ordered films of long-chain organic acids called Self- Assembled Monolayers (SAMs). Self-Assembled Monolayers are increasingly applied in microelectronics, sensors and electrocatalysis, but they also have a great potential in corrosion protection due to their unique properties. The organic molecules capable for forming SAMs consists of three parts - two functional groups and alkyl chain linking them. One of the functional groups is responsible for adsorption on the metal surface and is called the adhesion group or head of a molecule. The other functional group determines the layer properties and long alkyl chain represent the barrier to the diffusion of aggressive ions to the metal surface. The advantages of SAMs are simplicity of application, low cost and small amount of material needed to cover large areas. The aim of this work is to obtain deeper insight into SAM properties by monitoring the process of forming octadecylphosphonic acid (ODPA) protective film on various metal substrates (gold, copper and stainless steel) using electrochemical quartz crystal microbalance (EQCM), followed by investigation of their behaviour in corrosive media by simultaneous use of EQCM and electrochemical impedance spectroscopy.

corrosion protesction, self-assembled monolayers, octadecylphosphonic acid

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