Effect of deposition time on morphology, corrosion resistance and mechanical properties of Ti-containing conversion coatings on zinc

Szczygieł, B.; Winiarski, J.

doi:10.1016/j.matchemphys.2011.05.074

Cited by 25 publications

(16 citation statements)

References 23 publications

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“…89,37,60 Cracks were observed at the coating surface, especially after long immersion times. Cracks can form during exposure to the vacuum of an SEM chamber because of dehydration and shrinkage, but also can form before introduction into the SEM vacuum during exposure in dry air 49,52,69,79,80,94,96,106,127 or during a curing step at 70…”

Section: C137mentioning

confidence: 99%

“…64 The effect of immersion time was investigated in numerous studies to obtain the optimal coating parameters in terms of morphology, composition, thickness and corrosion resistance. 6,32,34,35,37,50,52,55,61,63,69,73,[77][78][79]88,90,93,94,96,102,107,110 The immersion time of metal substrates in conversion baths ranged from less than 3 minutes, 31,38,42,46,48,51,57,59,65,67,[70][71][72]85,86,95,97,101,106 and between 3 and 6 minutes. 30,47,53,64,78,87,[110]…”

Section: Conversion Bath Parametersmentioning

confidence: 99%

“…35,79 There are still possibilities for further improvement, especially in terms of additives and self-healing agents, as well as chemical post-treatment.…”

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Review—Conversion Coatings Based on Zirconium and/or Titanium

Milošev

Frankel

2018

J. Electrochem. Soc.

156

113

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There is a growing interest in conversion coatings based on titanium and/or zirconium as the result of the health and environmental issues associated with legacy chromate and phosphate conversion coatings. Any alternative technology should be environmentally friendly and cost effective, and also able to achieve comparable corrosion resistance and paint adhesion for ferrous and non-ferrous substrates. Conversion coatings based on titanium or zirconium seem to fulfill many of these requirements and thus offer a great potential for further applications. This literature review summarizes the scientific results in this rapidly growing area of research. Following the description of composition of conversion bath and deposition mechanism, the effects of process parameters for conversion baths such as pH, temperature, immersion time and agitation are presented together with coating characteristics. The effects of the type of substrate and substrate pre-treatment are explored for the most-studied substrates: Al alloys, zinc-coated steels and steels. Properties such as composition, morphology and thickness are summarized. The corrosion performance of the conversion coatings is discussed, as well as adhesion of organic coatings and delamination mechanism for a full coating system including substrate/coating/top-coat. Metals used in the construction of products and facilities in most applications, including industrial, infrastructure, transportation, construction, consumer goods, etc., are primarily selected from three groups: steels, zinc-coated (galvanized) steels, and aluminum alloys (AA).1 All of these materials require protection to prevent environmental degradation, and the most common approach to protection against corrosion is a multilayer coating system. Metal components are treated by a series of processes to create this coating system: cleaning, surface pre-treatment, and application of organic coating layers including primer and topcoat. Surface pre-treatments include anodizing (for aluminum alloys) and conversion coatings, which are the focus of this review. Conversion coatings are formed by immersion of a component in a chemical bath and reaction of the metal substrate with the components in the bath to form a layer that coats the surface. These layers provide some corrosion protection by acting as a barrier to the environment or releasing corrosion-inhibiting species. However, their primary role is to improve the adhesion of subsequently applied paint layers.The most important conversion coatings used for corrosion protection and adhesion promotion of ferrous and non-ferrous metal substrates are chromate conversion coatings (CCCs) and phosphate coatings. CCCs are highly corrosion protective. They consist of a backbone of chromium oxide/hydroxide with Cr in the 3+ oxidation state and also contain compounds with Cr in the 6+ oxidation state. 2-5The Cr(VI) provides the characteristic of self-healing, which is the ability to reform a protective coating after it has been breached by a mechanical or chemical proces...

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Section: C137mentioning

confidence: 99%

Section: Conversion Bath Parametersmentioning

confidence: 99%

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Review—Conversion Coatings Based on Zirconium and/or Titanium

Milošev

Frankel

2018

J. Electrochem. Soc.

156

113

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“…Inorganic compounds are commonly used to promote the formation of a conversion layer of hardly soluble compounds on the galvanized steel surface. Among them, conversion coatings based on molybdates (MoO 4 2− ), tungstates (WO 4 2− ), lanthanides (Ce, La), silicates (Na 2 SiO 3 , K 2 SiO 3 ), trivalent chromium (Cr (III)), titanium and zirconium (Ti, Zr), n‐ tetradecanephosponic acids, and phosphates (PO 4 3− ) have been tested on zinc substrate.…”

Section: Introductionmentioning

confidence: 99%

Sebacic acid as corrosion inhibitor for hot‐dip galvanized (HDG) steel in 0.1 M NaCl

Fedel

Poelman

Olivier

et al. 2019

Surface & Interface Analysis

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The potential of sebacic acid as a corrosion inhibitor for hot-dip galvanized steel in 0.1 M NaCl solution has been investigated. Different concentrations of the organic acid have been tested in order to understand the inhibition mechanism of the compound. The electrochemical test revealed a competitive mechanism between the dissolution of the metal in the acidified solution and the inhibition provided by the dicarboxylic species. The formation of a whitish layer consisting of zinc carboxylates and corrosion products was proved by means of scanning electron microscopy (SEM) investigation combined with Fourier transform infrared (FT-IR) analysis. A bidentate bridging coordination between the Zn(II) and the carboxylic species is suggested.

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“…[6][7][8] Furthermore, the environmental issues of chromium(VI) compounds due to health problems relating its carcinogenic nature, provide a high motivation to nd a suitable friendly anticorrosive alternative to chromate in recent decades. [9][10][11] Different novel CCs such as molybdenum, 12,13 cerium, 14,15 zirconium, [16][17][18][19] titanium 20,21 and vanadium [22][23][24][25][26][27][28][29][30] compounds are expected to be less environmentally harmful than the conventional conversion treatments.…”

Section: Introductionmentioning

confidence: 99%