engleski

Corrosion protection by self-assembled films of organic acids

Self-assembled monolayers (SAMs) of long-chain organic compounds have found their application in many fields such as sensors, electronic devices, lubrication as well as in corrosion protection. Most of the studies on SAMs application in corrosion protection are conducted by using alkanethioles SAMs on copper and silver. However, if metallic substrate is covered by an oxide layer corrosion protection by SAMs of alkanethioles is much weaker compared to those on non-oxidized metallic substrates. Thus, SAMs of long-chain organic acids that can bind strongly to oxidized metallic surfaces are much better choice for many commonly used metals and alloys. This work investigates the possibility of corrosion protection of stainless steel in chloride media by self-assembled mono- and multilayers of long-chain phosphonic acids. Various parameters of SAM preparation procedure determine if well- ordered and protective film will form, among others temperature, solution exposure time, surface roughness, solvent, etc. In this work the influence of solvent, organic acid concentration and drying time and temperature on its protective properties are examined. Based on the results obtained by electrochemical measurements and surface analysis, the optimal conditions for formation of protective organic film have been determined.

Corrosion protection, stainless steel, self-assembled monolayers

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