Anticorrosive performance of commercial nanoceramic coatings on AISI 1010 steel

Kerstner, Estela Knopp; Kunst, Sandra Raquel; Beltrami, Lílian Vanessa Rossa; Ortega-Vega, Maria Rita; Scienza, Lisete Cristine; Malfatti, Célia de Fraga

doi:10.1590/1516-1439.263514

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…All tests were carried out at 35°C up to 336 h with periodical observations. Digital polarized microscope (Dino-Lite, AM413ZT, Balerna, Switzerland) was used to capture the images of the exposed samples and the evaluation of the corrosion behaviour was carried out according to ASTM D714-02(2017) and ASTM D610-08(2019) standards that determine the degree of rusting and blistering of coated surfaces, respectively (Kerstner et al , 2014; Abd El-Wahab, 2015).…”

Section: Methodsmentioning

confidence: 99%

Study of the physical and electrochemical properties of hybrid paint system based on zinc-rich primer for mild steel protection

Al-Huseini

Ramesh

Shafaamri

et al. 2020

PRT

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Purpose This paper aims to study the corrosion performance and physical properties of hybrid paint systems based on zinc-rich primer (ZRP) and to determine the optimum modification approach that guarantees the most overall performance enhancement for the developed coating films that have been fabricated based on the usage of ZRP. Design/methodology/approach Four different approaches were applied to enhance the corrosion protection performance and the physical properties of ZRP-based paint systems, namely, incorporation with TiO2 pigment, introducing SiO2 nanoparticles, usage of polyamide curing agent and application of epoxy base coating as a second layer. The physico-mechanical properties were examined using pull-off test, glossiness test, pencil hardness test and cross-cut adhesion tape test. Moreover, the contact angle measurement was used to study the wettability of the developed coated surfaces and the corrosion protection performances were evaluated by using electrochemical impedance spectroscopy and salt spray test. Findings The obtained results revealed the ability of a certain approach to enhance the physical and corrosion protection properties of the ZRP paint system. Moreover, developing an intact hydrophobic nanocomposite paint system based on the usage of ZRP as the host matrix and SiO2 nanoparticles as the reinforcing agent was confirmed without altering the cathodic protection mechanism or the other desired characteristics of ZRP paint system. Originality/value The innovation of this work can be clearly observed by the ability to enhance the physical and corrosion protection properties of ZRP with four different approaches.

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Section: Methodsmentioning

confidence: 99%

Study of the physical and electrochemical properties of hybrid paint system based on zinc-rich primer for mild steel protection

Al-Huseini

Ramesh

Shafaamri

et al. 2020

PRT

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show abstract

“…Most often, before steel surfaces are painted, they are phosphated; galvanized and aluminum surfaces are chromated, although they are also phosphated when in the fabricated structure [1][2][3]. The disadvantages of the phosphating and chromating processes are known and have been repeatedly discussed in the literature [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…H2TiF6 + 2H2O ↔ TiO2 + 6HF (3) 3Fe + H2TiF6 + 6H2O → TiO2 + FeO + Fe2O3 + 6HF +4H2 (4) Fe + 2HF + H2O → FeF2•H2O + H2↑ (5) It is assumed that hexafluorotitanic acid is hydrolyzed at pH 4-5 on the surface of the metal to be treated (steel, zinc, or aluminum) with the formation of titanium oxides. These are at first adsorbed on the surface of heavy metals (Ni, Cu, Co, and Cr), which are on a steel substrate during contact and then expand, forming a continuous coating.…”

Section: Introductionmentioning

confidence: 99%

On the Mechanism of Formation of Conversion Titanium-Containing Coatings

et al. 2020

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The present work is devoted to the study of the mechanism of the process of formation of adhesive oxide-titanium coatings on steel, zinc, and aluminum surfaces. For the first time, the following hypothesis has been confirmed experimentally, namely, that nickel, being the first metal to be deposited on a steel substrate, creates active centers on which titanium oxides are formed, because the hydrolysis of hexafluorotitanic acid is adsorbed, which then form a continuous film. The data obtained, regarding the dependence of the coating thickness on the linear rate of the solution flow along the treated surface, indirectly confirm that the formation of insoluble titanium oxides occurs because of the alkalization of the solution adjacent to the surface. It has been established that in the presence of hexavalent molybdenum compounds in the solution as oxidizers, molybdenum is included in the coating in the form of oxides. It has been revealed that in the lower layers of the coating, molybdenum is contained in the form of compounds of molybdenum (V) and (VI), while in the upper layers, it is contained only in the form of the compound of molybdenum (VI).

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“…Metallic substrates receive organic coatings to improve their appearance and increase the protection against corrosion. The application of this coating is usually associated to a pretreatment to modify the metal surface in order to improve the organic coating adherence, thus increasing the protection against corrosion 1 . For many years, the industry has used phosphate and chromium-based conversion pretreatments on metal alloys such as mild steel and aluminum in order to achieve these objectives with satisfactory results 2 .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior During the Zirconium Conversion Coating Formation on AISI 1006 Steel

et al. 2019

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This study investigated a conversion coating based on hexafluorozirconic acid solution on cold-rolled (AISI 1006) steel sheets, in situ, at different pH values and immersion times. Electrochemical characterization was carried out by electrochemical impedance spectroscopy (EIS) with hexafluorozirconic acid bath as the electrolyte. Laser scanning confocal microscopy (LSCM) was used to evaluate the morphology of the coating in situ, i.e., during the coating formation. According to the results, the polarization resistance (Rp) of the conversion coating is affected by the immersion time and by the pH of the conversion bath. The electrochemical analyzes point out conversion baths at pH between 3.5 and 4.5 and immersion times from 600 to 900 s as optimal operating conditions, achieving an average polarization resistance of 713 ± 107 Ω cm 2 .

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Anticorrosive performance of commercial nanoceramic coatings on AISI 1010 steel

Cited by 8 publications

References 20 publications

Study of the physical and electrochemical properties of hybrid paint system based on zinc-rich primer for mild steel protection

Study of the physical and electrochemical properties of hybrid paint system based on zinc-rich primer for mild steel protection

On the Mechanism of Formation of Conversion Titanium-Containing Coatings

Electrochemical Behavior During the Zirconium Conversion Coating Formation on AISI 1006 Steel

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