Acta Metallurgica Sinica (English Letters) ›› 2017, Vol. 30 ›› Issue (4): 390-398.DOI: 10.1007/s40195-017-0554-y

Special Issue: 2017腐蚀虚拟专辑

• Orginal Article • Previous Articles     Next Articles

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

Liang Fan1(), Fujian Tang1, Signo T. Reis2, Genda Chen1(), Michael L. Koenigstein2   

  1. 1.Department of Civil, Architectural, and Environmental EngineeringMissouri University of Science and TechnologyRollaUSA
    2.Pro-Perma Engineered CoatingsRoesch Inc.BellevilleUSA
  • Received:2017-03-13 Revised:2017-03-13 Online:2017-03-13 Published:2017-05-17

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)