Fabrication and adhesive properties of thin organosilane films coated on low carbon steel substrates
TL;DR: In this paper, the fabrication and adhesive properties of thin organosilane films coated on the surface of low carbon steel substrates by curing γ-glycidoxypropyltrimethoxysilane (γ-GPS) solutions hydrolyzed in different solvents were investigated.
Abstract: We investigated the fabrication and adhesive properties of thin organosilane films coated on the surface of low carbon steel substrates by curing γ-glycidoxypropyltrimethoxysilane (γ-GPS) solutions hydrolyzed in different solvents. This method appears to be a promising alternative treatment for the chromium and phosphate mainly due to its excellent corrosion protection and adhesion properties to organic coatings and a non-toxic pretreatment. In this work the elemental distribution in γ-GPS films coated on low carbon steel substrates was analyzed by an energy dispersive X-ray spectrometer (EDX), and the effect of curing temperature and solution concentration on the chemical structures of this silane was also carried out with reflection–absorption infrared (RAIR) spectroscopy. We systematically investigated the processing variables regarding adhesive strength of the film, including hydrolysis solvents, hydrolysis time, solution concentration and curing temperature. Compared with other experimental conditions, the present results provided a consistent demonstration that γ-GPS films exhibited improved adhesive strength to metal substrates in case of using DI water/methanol mixture as hydrolysis solvent, hydrolysis time of 48 h, solution concentration of 10%, curing temperature of 150 °C and curing time of 1 h. The fracture mode of γ-GPS films varied with different deposition parameters.
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TL;DR: In this paper, a guideline formulation for maximum corrosion resistance with low environmental impact consist of a superprimer (a bis-silane with conventional resins, chrome free inhibitive pigments and additives) followed by epoxy or polyurethane top coat as per the exposure conditions.
Abstract: Sol–gel derived organic inorganic hybrid coatings are effective corrosion protective systems for metals. They offer an excellent adhesion to metal as well as to the subsequent coat via strong covalent bond and a three dimensional network of –Si–O–Si– linkages which helps to retard the penetration of corrosive medium through the coating. Unlike conventional surface protection methodology, silane based pre-treatment is an environment friendly technology with number of advantages like room temperature synthesis, chemical inertness, high oxidation and abrasion resistance, excellent thermal stability, very low health hazard etc. Further, the hybrid silane provides required flexibility and an increased compatibility with the subsequent coating in multicoat systems. The performance properties of hybrid systems depend on number of parameters like type of silane (mono or bis), degree of hydrolysis, type and dosage of inhibitive/barrier pigments (in case of pigmented system), application techniques, curing temperature and curing schedule, need to be optimized. A guideline formulation for maximum corrosion resistance with low environmental impact consist of a superprimer (a bis-silane with conventional resins, chrome free inhibitive pigments and additives) followed by epoxy or polyurethane top coat as per the exposure conditions.
105 citations
TL;DR: In this paper, the effect of surface roughness and surface chemistry on the initial adhesion strength and corrosive de-adhesion properties of adhesive bonds was investigated using single-lap joint tests.
52 citations
TL;DR: In this paper, the authors investigated the film forming kinetics and reaction mechanism of γ-GPS on low carbon steel surfaces by FTIR-ATR, AFM, NSS and theoretical calculation method.
44 citations
TL;DR: In this article, tetraethyl orthosilicate (TEOS) and 1,2-diaminoethanetetrakis methylenephosphonic acid (EDTPO) were evaluated as a anticorrosive treatment against corrosion for AA2024-T3 in a 0.05 ǫmol l −1 NaCl solution.
44 citations
TL;DR: In this paper, the authors characterized silane layers on the modified stainless steel surfaces and relate it to the adhesion in the injection-molded thermoplastic urethane-stainless steel hybrids.
41 citations
References
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Patent•
16 Sep 1974TL;DR: In this article, a carboxylic acid anhydride was used as a coupling agent for glass fibers to resinous plastics, including thermoplastics and thermosetting resins and the elastomeric materials.
Abstract: The silane coupling agents are prepared by reaction of the mercapto silane with a carboxylic acid anhydride whereby the mercapto group adds across the double bond of the anhydride. The compounds can be converted to the corresponding diacid by reaction with water, and are useful as coupling agents for bonding glass fibers to resinous plastics, including thermoplastics and thermosetting resins and the elastomeric materials.
1,331 citations
Book•
01 Jan 1994
TL;DR: Alkane Group Residues: C-H Group Alkenes, Oximes, Imines, Amidines, Azo Compounds: C=C, C=N, N=N Groups Triple Bond Compound: -CapaC-, -CAPaC, -NapaC, NapaN Groups Cumulated Double-Bond Compounds, X=Y=Z Group Hydroxyl Group Compound, O-H group Compounds O-O Group Ethers: G=1-O-G=2 Peroxides and
Abstract: Alkane Group Residues: C-H Group Alkenes, Oximes, Imines, Amidines, Azo Compounds: C=C, C=N, N=N Groups Triple Bond Compounds: -CapaC-, -Capa, -NapaC, -NapaN Groups Cumulated Double-Bond Compounds: X=Y=Z Group Hydroxyl Group Compounds: O-H Group Ethers: G=1-O-G=2 Peroxides and Hydroperoxides: -O-O- Group Amines, Imines, and Their Hydrohalides The Carbonyl Group: C=O Group Aromatic Compounds Six-Membered Ring Heterocyclic Compounds Five-Membered Ring Heterocyclic Compounds Organic Nitrogen Compounds Organic Halogen Compounds Sulphur and Selenium Compounds Organic Phosphorous Compounds Organic Silicon Compounds Boron Compounds The Near Infrared Region Inorganic Compounds and Coordination Complexes.
635 citations
Book•
01 Jan 1995
TL;DR: Early history of vibrational spectroscopy tools for infrared and Raman Spectroscopy VSP tools for different classes and states of compounds evaluation procedures special techniques and applications as mentioned in this paper.
Abstract: Early history of vibrational spectroscopy general survey of vibrational spectroscopy tools for infrared and Raman spectroscopy vibrational spectroscopy of different classes and states of compounds evaluation procedures special techniques and applications (Part contents)
521 citations
TL;DR: In this article, it is consistently observed that ultra-thin silane films offer excellent corrosion protection as well as paint adhesion to metals, and that the silane performance is comparable to, or in some cases better than, that of chromate layers.
274 citations