Corrosion Resistance of Transmission Pipeline Steel Coated with Five Types of Enamels

doi:10.1007/s40195-017-0554-y

Abstract

Abstract:

Corrosion is one of the main causes of incidents occurred in hazardous liquid and gas transmission pipelines in the USA, resulting in a loss of over $12 billion per year. In this study, the corrosion resistance of pipeline steel coated with five types of enamel was investigated in 3.5 wt% NaCl solution with linear polarization resistance and electrochemical impedance spectroscopy tests. Steel coupons were cut from API 5L X65 pipeline steel and coated with five types of enamels using the wet process. The microstructures of all enamel samples were examined by scanning electron microscopy. Experimental results indicate that all enamel coatings increase the corrosion resistance of pipeline steel, and pure enamel PE2, mixed enamels ME1 and ME2 have higher corrosion resistances than pure enamel PE1 and mixed enamel ME3.

Key words: Steel pipe, Enamel coating, Scanning electron microscopy (SEM), Electrochemical impedance spectroscopy (EIS)

Liang Fan, Fujian Tang, Signo T. Reis, Genda Chen, Michael L. Koenigstein. Corrosion Resistance of Transmission Pipeline Steel Coated with Five Types of Enamels[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(4): 390-398.

Figures/Tables 11

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	PE1	PE2	ME1	ME2	ME3	Uncoated
Ecorr (V vs SCE)	-0.208	-0.085	-0.145	-0.175	-0.513	-0.690
R_p (Ω)	2.17 × 10⁴	8.20 × 10⁸	8.93 × 10⁷	2.34 × 10⁷	3.76 × 10⁵	2.68 × 10²
Corrosion rate (mm/year)	2.15×10^-4	8.96×10^-8	6.47×10^-7	1.46×10^-6	1.55 ×10^-4	0.24

	PE1	PE2	ME1	ME2	ME3	Uncoated
Ecorr (V vs SCE)	-0.208	-0.085	-0.145	-0.175	-0.513	-0.690
R_p (Ω)	2.17 × 10⁴	8.20 × 10⁸	8.93 × 10⁷	2.34 × 10⁷	3.76 × 10⁵	2.68 × 10²
Corrosion rate (mm/year)	2.15×10^-4	8.96×10^-8	6.47×10^-7	1.46×10^-6	1.55 ×10^-4	0.24

	Y_c(Ωsⁿ/cm²)	n^c	R_c(Ωcm²)	C_c(F/cm²)	Y_dl(Ωsⁿ/cm²)	n_dl	R_ct(Ωcm²)	C_dl(F/cm²)
PE1	9.44 ×10^-8	0.78	4.24 ×10³	9.74 ×10^-9	7.65 ×10^-6	0.49	1.51 ×10⁴	7.95 ×10^-7
PE2	6.10 ×10^-10	0.96	2.72 ×10⁵	3.89 ×10^-10	2.09 ×10^-8	0.62	1.35 ×10⁹	1.62 ×10^-7
ME1	2.05 ×10^-9	0.86	6.27 ×10⁴	4.65 ×10^-10	4.55 ×10^-8	0.53	1.14 ×10⁸	1.93 ×10^-7
ME2	8.64 ×10^-8	0.67	3.06 ×10⁴	1.47×10^-8	1.25 ×10^-8	0.84	1.35 ×10⁷	8.00×10^-9
ME3	2.61 ×10^-7	0.65	7.31 ×10³	8.72 ×10^-9	3.44 ×10^-6	0.45	3.51 ×10⁵	3.60 × 10^-6
Uncoated	-	-	-	-	1.71 × 10^-2	0.78	217	0.025

	Y_c(Ωsⁿ/cm²)	n^c	R_c(Ωcm²)	C_c(F/cm²)	Y_dl(Ωsⁿ/cm²)	n_dl	R_ct(Ωcm²)	C_dl(F/cm²)
PE1	9.44 ×10^-8	0.78	4.24 ×10³	9.74 ×10^-9	7.65 ×10^-6	0.49	1.51 ×10⁴	7.95 ×10^-7
PE2	6.10 ×10^-10	0.96	2.72 ×10⁵	3.89 ×10^-10	2.09 ×10^-8	0.62	1.35 ×10⁹	1.62 ×10^-7
ME1	2.05 ×10^-9	0.86	6.27 ×10⁴	4.65 ×10^-10	4.55 ×10^-8	0.53	1.14 ×10⁸	1.93 ×10^-7
ME2	8.64 ×10^-8	0.67	3.06 ×10⁴	1.47×10^-8	1.25 ×10^-8	0.84	1.35 ×10⁷	8.00×10^-9
ME3	2.61 ×10^-7	0.65	7.31 ×10³	8.72 ×10^-9	3.44 ×10^-6	0.45	3.51 ×10⁵	3.60 × 10^-6
Uncoated	-	-	-	-	1.71 × 10^-2	0.78	217	0.025