Self healing ability of silicate conversion coatings on hot dip galvanized steels

Yuan, Meirong; J, Lu; Kong, Gang; Che, Chunshan

doi:10.1016/j.surfcoat.2011.03.088

Cited by 45 publications

(26 citation statements)

References 18 publications

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“…Another self-healing conversion coating is a silicate coating (deposited from a SiO 2 and Na 2 O solution) on galvanized steel. In this case, the self-healing effect is achieved owing to the ability of silicate anions to migrate and react with the substrate, as a result of which a new conversion coating containing Zn, O and Si forms [113]. Vanadia-based coatings prevent damage by forming an oxide layer enriched with this metal [110,111,114].…”

Section: Other Self-healing Coatingsmentioning

confidence: 99%

Self-healing coatings in anti-corrosion applications

2013

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Nonmetallic (based on polymers or oxides) and metallic protective coatings are used to protect metal products against the harmful action of the corrosion environment. In recent years, self-healing coatings have been the subject of increasing interest. The ability of such coatings to self-repair local damage caused by external factors is a major factor contributing to their attractiveness. Polymer layers, silica-organic layers, conversion layers, metallic layers and ceramic layers, to mention but a few, are used as self-healing coatings. This paper presents the main kinds of self-healing coatings and explains their selfhealing mechanisms.

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Section: Other Self-healing Coatingsmentioning

confidence: 99%

Self-healing coatings in anti-corrosion applications

2013

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“…Silicate conversion coatings are one of the best introduced alternatives to prevent aluminum alloys from corrosion [20,[22][23][24]. Silicate conversion coatings have attracted significant attention due to effective inhibitory against different types of corrosion [23][24][25][26], low cost [20,23], availability and non-toxic and environmentally friendly [20,23]. These coatings provide a superior inhibitory effect due to homogenous distribution of silicate on the surface [23].…”

Section: Introductionmentioning

confidence: 99%

Deposition and corrosion behavior of silicate conversion coatings on aluminum alloy 2024

Kazemi

Danaee

Zaarei

2014

Materialwissenschaft Werkst

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Potassium silicate was deposited on AA2024 aluminum alloy as environmentally friendly conversion coatings and its corrosion behavior were examined by means of electrochemical impedance spectroscopy, potentiodynamic polarization and surfaces techniques. Potentiodynamic polarization curves show significant decrease in corrosion current density of silicate coated aluminum in NaCl solution. The corrosion resistance was increased with increasing silicate concentration of coating baths. The results indicated that the coating applied from 3 molar silicate baths is more uniform and continuous. The X-ray diffraction (XRD) and energy discharge spectroscopy (EDS) spectra confirm the existence of silicate film on the AA2024 surface. The coating performance was evaluated in acidic and basic NaCl solution and the results show the stability of silicate conversion coating in these solutions.

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“…To further improve the corrosion resistance of zinc coatings, a green passivation treatment is usually carried out on the zinc surface. Many passivation techniques are currently used including trivalent chromium passivation, phosphate passivation, silicate passivation, molybdate passivation, silane passivation, and rare earth salt passivation . In particular, non‐toxic rare earth conversion films with excellent performance are widely used.…”

Section: Introductionmentioning

confidence: 99%

Growth behaviour of cerium‐based conversion coating on Zn‐5%Al alloy

Sun

Kong

Che

et al. 2018

Surface & Interface Analysis

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Cerium-based conversion coatings were deposited on a Zn-5%Al alloy by immersing the alloy in cerium nitrate aqueous solutions with various immersion times. The growth behaviour of the cerium-based conversion coating on the Zn-5%Al alloy was investigated by the electrochemical impedance spectroscopy (EIS), SEM, energy dispersive spectroscopy (EDS), and XPS techniques. The results reveal that the coating mainly consists of ZnO, Zn(OH) 2 , Ce(OH) 4 , Ce(OH) 3 , CeO 2 , and Ce 2 O 3 . The growth of the cerium-based conversion coating is accompanied by metal dissolution. The dissolution mainly occurs on the η-Zn surface of the phase boundary and continues to extend to the Zn-rich phase as the coating grows. EIS results show that with increasing immersion time, the corrosion resistance of the Ce conversion coating gradually increases in the early growth stage and then decreases when the cracks appear.

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Self healing ability of silicate conversion coatings on hot dip galvanized steels

Cited by 45 publications

References 18 publications

Self-healing coatings in anti-corrosion applications

Self-healing coatings in anti-corrosion applications

Deposition and corrosion behavior of silicate conversion coatings on aluminum alloy 2024

Growth behaviour of cerium‐based conversion coating on Zn‐5%Al alloy

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