The mechanism of inhibition by zinc phosphate in an epoxy coating

Abstract The presence of chalcopyrite increases the corrosion rate of carbon steel through a galvanic couple. In this study, five organic coating systems were evaluated for their strength against consequent corrosion in the presence of copper concentrate by electrochemistry impedance spectroscopy (EIS) measurement. The coating system studied are a single application epoxy coating (C1); a three-layer epoxy system with zinc-rich epoxy primer base coat, surface tolerant epoxy middle layer, and a top layer polyurethane (C2); a three-layer epoxy system that has the advantages of fast dry time consist of epoxy zinc phosphate base coat primer, the middle layer of the epoxy primer containing the pigment zinc phosphate and top layer polyurethane (C3); metallic pigmented polyurethane coating (C4), and an epoxy coating which can be applied to wet surfaces or in water (C5). All those systems have been tested by the EIS. The test results showed that C2, C3, C4, and C5 coating systems maintained good barrier properties during the immersion process, the low frequency |Z| is more than 108Ω.cm2 after 30 days of immersion exposure. Epoxy modified coating (C1) had the lowest impedance with resistance under 106 Ω.cm2 provide poor corrosion protection.

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Corrosion and cathodic disbondment resistance of epoxy coating on zinc phosphate conversion coating containing Ni 2+ and Co 2+

Journal of Industrial and Engineering Chemistry ◽

10.1016/j.jiec.2016.11.027 ◽

2017 ◽

Vol 47 ◽

pp. 154-168 ◽

Cited By ~ 30

Author(s):

M. Golabadi ◽

M. Aliofkhazraei ◽

M. Toorani ◽

A. Sabour Rouhaghdam

Keyword(s):

Zinc Phosphate ◽

Conversion Coating ◽

Epoxy Coating

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Studying the Effect of Nano Filler on Epoxy Properties used in storage tank Low Carbon Steel Protection

Journal of Petroleum Research and Studies ◽

10.52716/jprs.v10i4.387 ◽

2020 ◽

Vol 10 (4) ◽

pp. 121-136

Author(s):

Israa Abdulsatar Esmael ◽

Nadia Fakhry Ibraheem ◽

Faris Moayed Ahmed

Keyword(s):

Titanium Dioxide ◽

Iron Oxide ◽

Carbon Steel ◽

Storage Tank ◽

Zinc Phosphate ◽

Low Carbon Steel ◽

Epoxy Coating ◽

Organic Polymer ◽

Low Carbon ◽

Nano Titanium Dioxide

In this study a nano epoxy coating had been prepared to be used for the protection of the internal and external surfaces of storage tank (low carbon steel) from corrosion. A polymeric coating was reinforced with fillers such as red iron oxide, Zinc phosphate and nano titanium dioxide (TiO2) which have been used as anticorrosion. Pieces from low carbon steel was picked from storage tank and coated with two layers, the first layer was prepared from organic polymer (epoxy) with red iron oxide, the second layer was prepared from epoxy with (a nano titanium dioxide and Zinc phosphate). The fillers weight percentages were (0, 7, 10 and 13 % wt). The nano epoxy coating gave good results in limiting the corrosion, the corrosion rate results show that the best percentage of additives was (13,10 % wt) in salt solution 1.0 %wt ( NaCl, Na2SO3 and KCl ).The coating samples were immersed for 3 month at 25 OC in gas oil and cutting oil then was characterized using spectroscopic method (FTIR), physical and chemical tests add to characterization of particles size was done by SEM. The samples of TiO2 were characterized by XRD and evaluation of corrosion was made by using static potential test.

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Specification for dental zinc phosphate cement

10.3403/00042167 ◽

1980 ◽

Keyword(s):

Zinc Phosphate

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