Protective Action of Phosphate and Calcium-Containing Pigments under the Conditions of the Stress Corrosion Fracture of Steels

Zin, І. М.; Bilyi, L. М.; Gnyp, I. P.; Ratushna, M. B.

doi:10.1007/s11003-005-0088-8

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…However, chromate pigments are toxic materials that should be replaced by eco-friendly pigments with the same protective ability [17][18][19] . Various pigments such as CS and mixtures thereof, zinc phosphate, and iron oxide proved to be good choices due to their high anticorrosive and non-toxic properties [20][21][22][23] . In a previous publication, the authors reported CS has a better anticorrosive performance than red iron oxide that closely approaches the durability of chromate pigments…”

Section: Introductionmentioning

confidence: 99%

Characterization of Calcium-doped Silica Gel Prepared in an Aqueous Solution

Quang

Park²,

Kim³

et al. 2012

Resources Processing

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In this study, calcium-doped silica was prepared by modifying sodium silicate-based silica gel in an aqueous solution of Ca(OH)2. Silica gels with less than 1 mm in size with different pH values were treated in Ca(OH)2 solution at concentrations ranging from 2 to 20 g/L and aged at 25, 60, and 90°C for 40 min. The BET surface area of the silica gel decreased while its pore size increased considerably after modification in Ca(OH)2 solution. The pH of 5% calcium-doped silica in water ranged from about 8.5 to 10, depending on the pH of silica gel, the aging temperature, and the concentration of the Ca(OH)2. When the concentration of the Ca(OH)2 solution was 20%, needle-like crystals of calcium silicate hydrate formed over the surface of silica gel.

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Section: Introductionmentioning

confidence: 99%

Characterization of Calcium-doped Silica Gel Prepared in an Aqueous Solution

Quang

Park²,

Kim³

et al. 2012

Resources Processing

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“…The functioning of these compounds seems to involve a dual protection mechanism [3][4][5][6], which could represent an initial advantage over chromates and most of the other alternatives studied to date, since the inhibiting capacity of the anticorrosive pigment is accompanied by a capacity to retain potentially aggressive ions entering from the exterior. Moreover, the fact that corrosion inhibiting species are only released when the corrosive species pass through the paint coating, and that the amount released depends on the severity of the environment, means that the use of these inhibitors is more "economical" compared to chromates (highly soluble), and therefore long term anticorrosive protection is improved thanks to a lower degree of blistering, which is one of the main paint degradation mechanisms [7][8].…”

Section: Introductionmentioning

confidence: 99%

Paint systems formulated with ion-exchange pigments applied on carbon steel: Effect of surface preparation

Granizo

Vega

Díaz

et al. 2011

Progress in Organic Coatings

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Ion exchange pigments are a scientifically very interesting alternative to chromates thathave not yet been fully explored. This study considers the following candidate anticorrosive pigments: calcium-exchanged silica (Si/Ca), hydrotalcite/vanadate (HT/V) and calcium bentonite (Bentonite/Ca).Paint systems manufactured with these ion exchange pigments have been subjected to accelerated corrosion laboratory tests: humidity condensation (HC) and salt fog (SF), simulating environments of low and high corrosivity, in order to assess their anticorrosive behavior in comparison with a zinc chromate reference system. For this purpose the degree of coating degradation has been monitored: blistering, underfilm corrosion and delamination from scribe.Electrochemical impedance spectroscopy (EIS) has allowed us to evaluate and quantify the anticorrosive capacity of these ion exchange pigments when incorporated in the paint coating. This paper focuses on the effect of several parameters of interest when designing a paint system: a) sanding treatment of the base steel prior to application of the primer paint; b) pigment concentration in the primer paint coating; and c) application of a topcoat layer over the primer coating.

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