Sol–gel derived hybrid coatings as an environment friendly surface treatment for corrosion protection of metals and their alloys

2012 ◽  
Vol 64 (1) ◽  
pp. 124-134 ◽  
Author(s):  
Dinesh Balgude ◽  
Anagha Sabnis
Keyword(s):  
Surface Treatment ◽  
Corrosion Protection ◽  
Sol Gel ◽  
Hybrid Coatings ◽  
Environment Friendly ◽  
Protection Of Metals

Plasma Surface Treatment: Effects on Mechanical and Corrosion Protection Properties of Hybrid Sol–Gel Coatings

2019 ◽  
Author(s):  
R. Subasri
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Surface Treatment ◽  
Corrosion Protection ◽  
Sol Gel ◽  
Surface Cleaning ◽  
Al Alloys ◽  
Plasma Surface ◽  
Wet Chemical ◽  
Pre Treatment

Surface cleaning and activation of substrates are two critical processes that affect the mechanical and corrosion resistance properties of protective coatings when deposited on the substrates. Surface cleaning removes the contaminants, for example, grease on the substrate, and surface activation introduces active bonds on the substrate thereby increasing the surface free energy. Conventionally, surface cleaning and activation of aluminum and its alloys are carried out by a wet chemical technique. A convenient and safe alternate to the wet chemical cleaning/activation would be to use plasma for the same purpose. Plasma surface pre-treatment greatly improves adhesion of coatings deposited, which is very vital for good corrosion protection and mechanical properties such as scratch and abrasion resistance. Cold and atmospheric air plasma treatments have been the most widely studied pre-treatments for Al alloys. This article will discuss the advancements in the use of plasma treatment on Al/Al alloys and its effect on corrosion resistance and mechanical properties of coatings deposited after the surface treatment.

scholarly journals Study of Ceramic and Hybrid Coatings Produced by the Sol-Gel Method for Corrosion Protection

2009 ◽  
Vol 2 (1) ◽  
pp. 197-203 ◽  
Author(s):  
G. Carbajal-de la Torre ◽  
M. A. Espinosa-Medina ◽  
A. Martinez-Villafane ◽  
J. G. Gonzalez-Rodriguez ◽  
V. M. Castano
Keyword(s):  
Corrosion Protection ◽  
Sol Gel ◽  
Hybrid Coatings ◽  
Gel Method ◽  
Sol Gel Method

Electrochemically generated sol–gel films as inhibitor containers of superhydrophobic surfaces for the active corrosion protection of metals

2016 ◽  
Vol 4 (2) ◽  
pp. 649-656 ◽  
Author(s):  
Xue-Fen Zhang ◽  
Rui-Jiao Chen ◽  
Yan-Hua Liu ◽  
Ji-Ming Hu
Keyword(s):  
Corrosion Protection ◽  
Sol Gel ◽  
Superhydrophobic Surfaces ◽  
Additional Function ◽  
Sol Gel Films ◽  
Protection Of Metals ◽  
Active Corrosion

The present work shows a new contribution to the design of superhydrophobic surfaces with the additional function of active corrosion protection, through the encapsulation of inhibiting agents.

Effect of Amino-Modified Silica Nanoparticles on the Corrosion Protection Properties of Epoxy Resin-Silica Hybrid Materials

2008 ◽  
Vol 8 (6) ◽  
pp. 3040-3049 ◽  
Author(s):  
Kung-Chin Chang ◽  
Hui-Fen Lin ◽  
Chang-Yu Lin ◽  
Tai-Hung Kuo ◽  
Hsin-Hua Huang ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Corrosion Protection ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Covalent Bond ◽  
Surface Hydrophobicity ◽  
Hybrid Coatings ◽  
Morphological Observation ◽  
Modified Silica ◽  
Silica Hybrid

In this paper, a series of organic–inorganic hybrid materials consisting of epoxy resin frameworks and dispersed nanoparticles of amino-modified silica (AMS) were successfully prepared. First of all, the AMS nanoparticles were synthesized by carrying out the conventional acid-catalyzed sol–gel reactions of tetraethyl orthosilicate (TEOS) in the presence of (3-aminopropyl)-trimethoxysilane (APTES) molecules. The as-prepared AMS nanoparticles were then characterized by FTIR, 13C-NMR and 29Si-NMR spectroscopy. Subsequently, a series of hybrid materials were prepared by performing in-situ thermal ring-opening polymerization reactions of epoxy resin in the presence of as-prepared AMS nanoparticles and raw silica (RS) particles. The as-prepared epoxy-silica hybrid materials with AMS nanoparticles were found to show better dispersion capability than that of RS particles existed in hybrid materials based on the morphological observation of transmission electron microscopy (TEM). The hybrid materials containing AMS nanoparticles in the form of coating on cold-rolled steel (CRS) were found to be much superior in corrosion protection over those of hybrid materials with RS particles when tested by a series of electrochemical measurements of potentiodynamic and impedance spectroscopy in 5 wt% aqueous NaCl electrolyte. The increase of corrosion protection effect of hybrid coatings may have probably resulted from the enhancement of the adhesion strength of the hybrid coatings on CRS coupons, which may be attributed to the formation of Fe—O—Si covalent bond at the interface of coating/CRS system based on the FTIR-RAS (reflection absorption spectroscopy) studies. The better dispersion capability of AMS nanoparticles in hybrid materials were found to lead more effectively enhanced molecular barrier property, mechanical strength, surface hydrophobicity and optical clarity as compared to that of RS particles, in the form of coating and membrane, based on the measurements of molecular permeability analysis, dynamic mechanical analysis, contact angle measurements and ultraviolet-visible transmission spectra, respectively.

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