Several Methods For Inhibitors Loading And Their Applications In Anti-corrosion Painting System

Coating system is the most effective and widespread strategy applied to corrosion protection.Conventional coatings on the metal surface only provide passive barriers.While corrosion inhibitor-loaded coating system give additional active corrosion protection.Incorporation methods of inhibitor include direct doping and encapsulated in micro-and nanocontainers.Employment of containers avoid damage of the coating integrity and quick leak of inhibitors.In this thesis,we built active coating system and superhydrophobic film based on one-step method of preparing inhibtor-loaded mesoporous silica nanocontainers.And active coating system based on alkali diffusion-catalyzed preparation of silica pretreatment layer was manufactured.In addition,rough surface of mild steel with inhibitor-loading ability and its application for active corrosion protection was investigated.The main contents of this thesis are listed as follows:(1)We present a simple one-step method of preparing inhibitor-loaded mesoporous silica nanocontainers and its incorporation with coating for active corrosion protection.This synthetic strategy is based on the high solubility of organic inhibitors in the hydrophobic cores of template micelles without excess steps of templates removal or inhibitors loading.Additional,the new method avoids employment of organic solvents and is enviroumentally friendly.The obtained nanocontainers possess a relatively high uptake and acid-responsive release of inhibitors.The coating doped with these nanocontainers exhibits effective corrosion proteciton.(2)Inhibitor-loaded superhydrophobic mesoporous silica film was clcctrodeposited on aluminum alloy with CTAB templates.This superhydrophobic film shows better corrosion protection ability when compared with analogous superhydrophobic silica film.On the one hand,addition of CTAB templates provides multi-level rough structure by accelerating condensation of silane,promoting superhydrophobic property of film.On the other hand,inhibitor dissolves in CTAB hydrophobic micelles and thus release of inhibitor is acid-responsive.It is promotion of superhydrophobic property and loading of inhibitors that enhance corrosion protection of superhydrophobic silica film.(3)A simple alkali diffusion-catalyzed preparation of silica pretreatment layer was utilized to build coating system with active corrosion protection.With diffusion of alkali adsorbed on mild steel to silane solution spontaneously,condensation of silane was catalyzed and silica film with a thickness of?8 ?m formed.The silica film with multi-level micro and nano rough surface can form "inter-locking" structure with polymer coatings and enhance interaction between metal substrate and coatings.Active corrosion protection coating system based on the porous silica film pretreatment layer exhibits good anti-corrosion perfoamance.(4)The rough surface on mild steel of micro-and submicro-sacle was obtained by etching of dilute ethanol solution of HNO3.Polymer oatings permeate into gaps and pores on the substrate surface and form "inter-locking" structure.As a result,interaction between metal substrate and coatings and corrosion protection ability of coating system was promoted.In addition,porous structure of the rough metal surface has the potential of loading inhibitors,promising for application of active corrosion protection.