Development of conversion coating on mild steel prior to sol gel nanostructured Al2O3 coating for enhancement of corrosion resistance

Tiwari, Shashi Kant; Sahu, Ranjan K.; Pramanick, A K; Singh, Raghuvir

doi:10.1016/j.surfcoat.2011.04.087

Cited by 96 publications

(35 citation statements)

References 32 publications

(40 reference statements)

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“…The need to replace the harmful chromate-based surface treatments of galvanised steel with environmentally friendly methods promoted the development of new treatments based on electropolymerization [1], conversion coatings [2][3][4][5] and sol-gel synthesis [6,7,8]. Among these, the sol-gel coatings for corrosion protection of metals are considered a promising alternative due to their easy preparation at low temperatures and to the possibility to incorporate various additives and/or nanoparticles in order to control the physical and chemical properties of the coatings [9,10].…”

Section: Introductionmentioning

confidence: 99%

Silica sol – gel protective coatings against corrosion of zinc substrates

Volentiru¹,

Nyári²,

Szabó³

et al. 2014

Period. Polytech. Chem. Eng.

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[6,7,8]. Among these, the sol-gel coatings for corrosion protection of metals are considered a promising alternative due to their easy preparation at low temperatures and to the possibility to incorporate various additives and/or nanoparticles in order to control the physical and chemical properties of the coatings [9,10].Layers of oxides such as SiO 2 , ZrO 2 , Al 2 O 3 , TiO 2 , CeO 2 , etc. provide effective protection to metal substrates due to their very good chemical and thermal stability. Among them, SiO 2 layers act very efficiently as corrosion protectors of metals under different temperatures. Moreover, due to the fact that using alkoxysilanes as precursors in the formation of silica solgels the reaction is quite gentle, this approach is extensively used in pretreatment of metal surfaces [6]. It should be emphasized that the introduction of dopants, such as small amounts of nanoparticles (e.g. CeO 2 , ZrO 2 [10] etc.) in the SiO 2 layer could significantly improve the barrier properties of the coatings and, consequently, their corrosion resistance. Moreover, properties of SiO 2 sol-gel coatings and nanoparticles can be influenced by using different surfactants during the preparation process [11].Zinc has found widespread use as the basis of a whole range of sacrificial coatings for ferrous substrates. However, the life span of such coatings is limited due to the aggressive nature of some environments, particularly those containing industrial pollutants. Consequently, efforts are made in order to enhance their service life.In this context, our investigation was focused on the preparation and characterization of different type of porous and compact silica-based protective coatings on zinc and glass substrates by using sol-gel method, in the absence or in the presence of surfactants. The optical and the electrochemical properties of the coatings, as well as the effect of film thickness on its protection ability were also studied.

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Section: Introductionmentioning

confidence: 99%

Silica sol – gel protective coatings against corrosion of zinc substrates

Volentiru¹,

Nyári²,

Szabó³

et al. 2014

Period. Polytech. Chem. Eng.

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“…As a result, the coating material spreads forming a thin film on the surface. Film properties, such as thickness, will be affected by several factors such as: viscosity, surface tension, drying ease and the rotation speed [75].…”

Section: Spin-coatingmentioning

confidence: 99%

Green Methods for Corrosion Control

Emran¹,

Ali²,

lehaibi³

2018

Corrosion Inhibitors, Principles and Recent Applications

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Corrosion of metals is a serious environmental problem. Most of the corrosion inhibitors are synthetic chemicals that are hazardous to environments and expensive. Today, there has been an increasing search for green corrosion inhibitors, due to the toxicity of some inhibitors. Green corrosion inhibitors are biodegradable and free of heavy metals or other toxic compounds. There is an intensive effort underway to develop new plant origin corrosion inhibitors for metal subjected to various environmental conditions. Salts of rare earth elements can be also used as inorganic alternative nontoxic corrosion inhibitors. Sol-gel coatings can be recommended as green protective films for metal corrosion. The origin of sol-gel process, its advantages and limitations, and the type of coating method are presented in this chapter, as well as a brief summary of recent literature concerning the use of hybrid inorganic-organic sol-gel and nanostructured sol-gel protective coatings for metal corrosion in different media.

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“…Mild steel exhibits low cost, readily available and good mechanical characteristics among others [1][2][3][4]. The most prominent concern is the huge degradation rates associated with this material.…”

Section: Introductionmentioning

confidence: 99%

Study of Particle Incorporation and Performance Characteristic of Aluminium Silicate-Zirconia Embedded on Zinc Rich Coatings for Corrosion and Wear Performance

Fayomi¹,

Popoola²,

Ige³

et al. 2017

Asian J. Chem.

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Composite coatings of Zn-Al6O13Si2 and Zn-Al6O13Si2-ZrO2 were electroplated on mild steel from Zn 2+ ions bath and homogeneously dispersed nano Al6O13Si2-ZrO2 particulates were achieved. The corrosion resistance characteristics of the deposited coatings were evaluated by linear polarization method. The microstructural properties of the multilayer produce coatings were examined by scanning electron microscope equipped with energy dispersive spectrometer, X-ray diffraction and atomic force microscope. The thermal deformation were observed in 250 ºC for 4 h and mechanical properties of the composite coatings were investigated using diamond base Dura scan microhardness tester. From the observed results, it was shown that the incorporation of particles into the electrolyte change the microstructure characteristics of developed composite and improved drastically the thermomechanical performance of the coatings.

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Development of conversion coating on mild steel prior to sol gel nanostructured Al2O3 coating for enhancement of corrosion resistance

Cited by 96 publications

References 32 publications

Silica sol – gel protective coatings against corrosion of zinc substrates

Silica sol – gel protective coatings against corrosion of zinc substrates

Green Methods for Corrosion Control

Study of Particle Incorporation and Performance Characteristic of Aluminium Silicate-Zirconia Embedded on Zinc Rich Coatings for Corrosion and Wear Performance

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