Microstructure and adherence of cobalt containing and cobalt free enamels to low carbon steel

Samiee, Leila; Sarpoolaky, H.; Mirhabibi, A.R.

doi:10.1016/j.msea.2006.12.108

Cited by 47 publications

(15 citation statements)

References 13 publications

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“…As shown in Fig. 2b, the PE coating is approximately 150 m thick and has many small air bubbles (25 m in diameter) and few large air bubbles (100 m in diameter), which are generated from the oxidation-reduction reaction of enamel with the steel during the enameling process such as [14,15] These gases such as H 2 , H 2 O, CO, and CO 2 increased the porosity of enamel coating, resulting in an increased susceptibility of substrate steel to corrosion. The ME coating ( Fig.…”

Section: Thickness Porosity and Surface Damage Of Coatingsmentioning

confidence: 99%

Chloride-induced corrosion mechanism and rate of enamel- and epoxy-coated deformed steel bars embedded in mortar

Tang

Chen

Brow

2016

Cement and Concrete Research

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The chloride-induced corrosion mechanisms of uncoated, pure enamel (PE)-coated, mixed enamel (ME)-coated, double enamel (DE)-coated, and fusion bonded epoxy (FBE)-coated deformed steel bars embedded in mortar cylinders are investigated in 3.5 wt.% NaCl solution and compared through electrochemical tests and visual inspection. Corrosion initiated after 29 or 61 days of tests in all uncoated and enamel-coated steel bars, and after 244 days of tests in some FBE-coated steel bars. In active stage, DE-and FBE-coated steel bars are subjected to the highest and lowest corrosion rates, respectively. The uncoated and ME-coated steel bars revealed relatively uniform corrosion while the PE-, DE-, and FBEcoated steel bars experienced pitting corrosion around damaged coating areas. Due to the combined effect of ion diffusion and capillary suction, wet-dry cyclic immersion caused more severe corrosion than continuous immersion. Both exposure conditions affected the corrosion rate more significantly than the water-cement ratio in mortar design.

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Section: Thickness Porosity and Surface Damage Of Coatingsmentioning

confidence: 99%

Chloride-induced corrosion mechanism and rate of enamel- and epoxy-coated deformed steel bars embedded in mortar

Tang

Chen

Brow

2016

Cement and Concrete Research

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“…Gaseous CO, CO 2 , and H 2 are generated during the firing process of enameling. When cooled down, these gases were trapped as a thick layer of enamel solidifies; this generated the isolated air bubbles [13,14]. Figure 4a,b represents the stitched images of five SEMs taken along a radial direction of the damaged coating, as shown in the detailed damaged zone in Figure 1.…”

Section: Coating Microstructurementioning

confidence: 99%

Corrosion Resistance of Pipeline Steel with Damaged Enamel Coating and Cathodic Protection

Fan

Reis²,

Chen

et al. 2018

Coatings

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This paper presents the first report on the corrosion resistance of pipeline steel with damaged enamel coating and cathodic protection in 3.5 wt % NaCl solution. In particular, dual cells are set up to separate the solution in contact with the damaged and intact enamel coating areas, to produce a local corrosion resistance measurement for the first time. Enamel-coated steel samples, with two levels of cathodic protection, are tested to investigate their impedance by electrochemical impedance spectroscopy (EIS) and their cathodic current demand by a potentiostatic test. Due to its glass transition temperature, the enamel-coated pipeline can be operated on at temperatures up to 400 • C. The electrochemical tests show that cathodic protection (CP) can decelerate the degradation process of intact coating and delay the electrochemical reactions at the enamel-steel interface. However, CP has little effect on the performance of coating once damaged and can prevent the exposed steel from corrosion around the damaged site, as verified by visual inspections. Scanning electron microscopy (SEM) indicated no delamination at the damaged enamel-steel interface due to their chemical bond.

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“…40 wt% of iron presented in these dendrites. This is attributed to the diffusion of iron from the steel to the coatings and, as a result, strong bonds formed at the interface between the coating and the substrate (Samiee et al, 2007). Note that the growth direction of dendrites is from substrate to coating and the coating is therefore well bonded to the substrate.…”

Section: Phase Composition Of Coatingsmentioning

confidence: 99%

Glass ceramic coated rebar for high corrosion resistance and enhanced rebar–concrete bond

Yang¹,

Zheng²,

Wang³

et al. 2014

Magazine of Concrete Research

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Low-softening glass ceramic coatings were applied onto the surface of reinforcing steel rebars via slurry dip-coating and sintering. This work investigated the tensile strength properties of coated rebars, the phase compositions and microstructures of these coatings and their corrosion resistance and bond strength at the rebar-concrete interface.X-ray diffraction analysis revealed that the sintering process led to crystallisation inside the coatings. Scanning electron microscopy images demonstrated that the growth direction of dendrites was from the substrate onto the coating and the coating was well bonded to the substrate. Samples of mix-coated and duplex-coated rebars showed a much lower corrosion rate than a single-coated sample. Compared with the bare rebar, all the coated samples showed more than 40% higher bond strength at the rebar-concrete interface.

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Microstructure and adherence of cobalt containing and cobalt free enamels to low carbon steel

Cited by 47 publications

References 13 publications

Chloride-induced corrosion mechanism and rate of enamel- and epoxy-coated deformed steel bars embedded in mortar

Chloride-induced corrosion mechanism and rate of enamel- and epoxy-coated deformed steel bars embedded in mortar

Corrosion Resistance of Pipeline Steel with Damaged Enamel Coating and Cathodic Protection

Glass ceramic coated rebar for high corrosion resistance and enhanced rebar–concrete bond

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