A hybrid organic–inorganic sol–gel coating for protecting aluminium alloy 7075-T6 against corrosion in Harrison’s solution

Rodič, Peter; Iskra, Jernej; Milošev, Ingrid

doi:10.1007/s10971-014-3278-8

Cited by 67 publications

(71 citation statements)

References 35 publications

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“…19 Good corrosion properties were achieved when ZTP was chelated with methacrylic acid (MAA). 20 Similar behavior was observed when hybrid coatings based on TEOS, MAPTMS, ZTP and MAA were applied to AA7075-T6 alloy. 20,21 The chelating reagents also influence the polymerization of the sol constituents, especially the acrylic group that polymerizes in the presence of UV light.…”

supporting

confidence: 55%

“…Synthesis of sols and deposition of coatings.-Organic-inorganic hybrid coatings were synthesized according to previous studies 20,21,32 by combining two, separately prepared, alkoxide sols (Sol 1 and Sol 2). Sol 1 is a mixture of TEOS and MAPTMS hydrolysed under acid conditions.…”

Section: Methodsmentioning

confidence: 99%

“…20,21,32,33 Different ageing and curing treatments were used (Table I). Sols TMZ-1 to TMZ-5 were aged for 48 h before application in the form of coating and cured at 100…”

Section: Methodsmentioning

confidence: 99%

“…20,21 The chelating reagents also influence the polymerization of the sol constituents, especially the acrylic group that polymerizes in the presence of UV light. To improve the cross-linking by UV radiation, an organic resin, photoinitiator or diluent/monomer is often added.…”

Section: 3mentioning

confidence: 99%

“…34 ZrO 2 nanoparticles were also formed with other chelating reagents, such as acetylacetone, 2,2 -bipyridine and 3,4-diaminobenzoic acid. 19,20,23 The degree of corrosion protection depends on the type of chelating agent used. 20,35 The hybrid silane coatings based on TEOS, MAPTMS, ZTP and MAA are amorphous and do not contain ZrO 2 particles seen by SEM, AFM and TEM techniques.…”

mentioning

confidence: 99%

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Electrochemical and Salt Spray Testing of Hybrid Coatings Based on Si and Zr Deposited on Aluminum and Its Alloys

Rodič

Milošev

2015

J. Electrochem. Soc.

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Hybrid coatings based on Si and Zr were assessed for their protection of aluminum and its alloys 2024-T3 and 7075-T6 against corrosion in 0.5 M NaCl. Coatings were prepared from sol synthesized from mixtures of tetraethyl orthosilicate and 3-methacryloxypropyl trimethoxysilane to which various concentrations of zirconium tetrapropoxide and methacrylic acid were added. Short-and long-term electrochemical behavior was assessed. The degree of protection was dependent on the sol composition, ageing time and curing temperature. A coating containing Zr/Si ratio of 0.41, aged for 48 h and cured at 100 • C exhibited the best combination of resistance towards general and localized corrosion. Electrochemical parameters obtained under polarization (corrosion current density of 4.4 nA/cm 2 and stability up to 7 V), and under open circuit conditions (impedance in the few tens of Mohm cm 2 after one week immersion) prove that the protection was high. At other conditions, such as higher Zr/Si ratios, shorter ageing time or curing at room temperature, protection was excellent early after immersion but then lessened rapidly. Coatings prepared under optimal conditions provided a high degree of protection over 500 hours salt spray testing, especially on aluminum metal. These coatings have the potential to provide good protection in chloride environments. While aluminum has good corrosion resistance in seawater, its high-strength alloys in the 2xxx (Al-Cu-Mg) and 7xxx series (Al-ZnMg) are normally not recommended for use under these conditions. 1,2Since there is an ongoing need for light-weight, high-strength materials, the possibility of using alloys other than those of the series 5xxx (Al-Mg-Mn) and 6xxx (Al-Mg-Si) normally recommended for sea-coast applications has to be considered. 2,3Aluminum and its alloys are highly susceptible to oxidation, resulting in the passivation of the surface by a 0.01 to 10 μm thick oxide layer when exposed to air. This naturally formed oxide protects aluminum under atmospheric conditions.2 Passivation of the alloys is, however, less effective. Due to the presence of unevenly distributed intermetallic particles (IMPs), the passive film is, overall, thinner and less uniform. IMPs such as Al 2 CuMg, Al-Cu-Mn-Fe, Al 2 Cu, Al 3 Fe, MgSi 2 , MgZn 2 , create local galvanic cells that promote corrosion on the surface. [4][5][6] Al 2 O 3 is a good insulator but, when containing IMPs, is a semiconductor that allows limited passage of electrons.2 High concentrations of chloride ions allows localized breakdown of the aluminum oxide film, most commonly observed as pitting, crevice or galvanic corrosion.Al alloys have been protected for decades using chromate conversion coatings. In the last decade these coatings have been widely prohibited within 7 and outside 8 the EU due to the fact that hexavalent chromium is a toxic, carcinogenic and environmentally hazardous compound.9-11 Other environmentally hazardous compounds, such as volatile organic compounds (VOCs) used, for example, in the painting industry, have ...

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supporting

confidence: 55%

Section: Methodsmentioning

confidence: 99%

“…20,21,32,33 Different ageing and curing treatments were used (Table I). Sols TMZ-1 to TMZ-5 were aged for 48 h before application in the form of coating and cured at 100…”

Section: Methodsmentioning

confidence: 99%

Section: 3mentioning

confidence: 99%

mentioning

confidence: 99%

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Electrochemical and Salt Spray Testing of Hybrid Coatings Based on Si and Zr Deposited on Aluminum and Its Alloys

Rodič

Milošev

2015

J. Electrochem. Soc.

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High‐performance ZSR/P(MMA/BA) composites with enhanced thermal and excellent water resistance properties

Chen,

Wu,

et al. 2024

J of Applied Polymer Sci

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Acrylate had developed rapidly because of its excellent chemical resistance, high‐gloss surface, and weather resistance. However, the poor heat resistance of acrylate limited its application in coatings. To overcome this problem, an organic–inorganic hybrid polymer of zirconium silicone resin (ZSR)‐modified acrylate has been successfully synthesized by solution polymerization. The results indicated that the heat resistance of acrylate was significantly improved due to the SiOSi and SiOZr structures of ZSR and the increased cross‐linking density induced by ZSR. After the incorporation of ZSR, the decomposition temperatures of 5% of acrylate increased from 300.4 and 349.2°C. The performance of the ZSR/(P(MMA/BA)) showed no significant change in uniformly heating at 200°C for 24 h. The composite films showed hydrophobicity, with the contact angles increasing to more than 90°. The S4 sample displayed the outstanding comprehensive performance, that is, 5% weight loss at 341.3°C, water contact angle of 97.9°, elongation at break of 852%, and tensile strength of 9.9 MPa. The high‐performance heat resistant coating is a promising material for application in architecture, decoration, and mechanical equipment.

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Self-Healing Corrosion-Protective Sol–Gel Coatings Based on Extrinsic and Intrinsic Healing Approaches

AbdolahZadeh

Zwaag

Garcia

2016

Advances in Polymer Science

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A hybrid organic–inorganic sol–gel coating for protecting aluminium alloy 7075-T6 against corrosion in Harrison’s solution

Cited by 67 publications

References 35 publications

Electrochemical and Salt Spray Testing of Hybrid Coatings Based on Si and Zr Deposited on Aluminum and Its Alloys

Electrochemical and Salt Spray Testing of Hybrid Coatings Based on Si and Zr Deposited on Aluminum and Its Alloys

High‐performance ZSR/P(MMA/BA) composites with enhanced thermal and excellent water resistance properties

Self-Healing Corrosion-Protective Sol–Gel Coatings Based on Extrinsic and Intrinsic Healing Approaches

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