Prevention of Corrosion in a Harsh Environment Using Zinc Primer

Prevention of Corrosion in a Harsh Environment Using Zinc Primer Z.M. Muntasser; Z.M. Muntasser Dalhousie University Search for other works by this author on: This Site Google Scholar M.M. Al-Darbi; M.M. Al-Darbi Dalhousie University Search for other works by this author on: This Site Google Scholar J.E. Paez; J.E. Paez Dalhousie University Search for other works by this author on: This Site Google Scholar H.H. Vaziri; H.H. Vaziri Dalhousie University Search for other works by this author on: This Site Google Scholar M.R. Islam M.R. Islam Dalhousie University Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Production and Operations Symposium, Oklahoma City, Oklahoma, March 2001. Paper Number: SPE-67249-MS https://doi.org/10.2118/67249-MS Published: March 24 2001 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Muntasser, Z.M., Al-Darbi, M.M., Paez, J.E., Vaziri, H.H., and M.R. Islam. "Prevention of Corrosion in a Harsh Environment Using Zinc Primer." Paper presented at the SPE Production and Operations Symposium, Oklahoma City, Oklahoma, March 2001. doi: https://doi.org/10.2118/67249-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Oklahoma City Oil and Gas Symposium / Production and Operations Symposium Search Advanced Search AbstractHarsh environmental conditions prevail in most petroleum pipelines as well as downhole tubulars. Under these conditions, corrosion can have adevastating effect on both petroleum production and transportation. The petroleum industry has been using inorganic zinc coating as a primer coating that can withstand prolonged services. It is well known that zinc reacts with steel to form a very strong bond that is not easily broken when subjected to HARSH CONDITIONS. However, several areas of weakness persist. There is no existing method to select the most effective primer among many that are available commercially. The current methods do not optimize the thickness of the primer and the mechanisms of corrosion prevention in the presence of abrasive materials are not well understood. This paper addresses these shortcomings of the past and proposes a comprehensive technique for corrosion prevention in harsh environmental conditions.In a series of experiments, corrosion (both onset and growth) is observed in various pH conditions using various thicknesses of zinc primers. In order to simulate solid/solid interaction (e.g. pipeline in an environment where sands and dusts prevail), sand blasting is performed for a pre-determined period. In this, the time of sand blasting was considered to be crucial since the time in the laboratory must be scaled down to model field conditions. For different cases, the nature of corrosion and the extent of growth were observed both in the presence and absence of top coatings. The extent of corrosion under sand abrasion was also observed. A procedure is recommended for determining optimum thickness of zinc primers under various environmental conditions (e.g. pH, sand erosion). Top coatings were found to be necessary for several of the conditions. Fundamental chemistry as well as fractal modeling is used to define the kinetics of corrosion growth. The role of zinc primer in developing a barrier is incorporated. The study results compare favorably with the experimental results.IntroductionMost petroleum structures including pipelines, refiners and tanks, are made of steel, which can be subject to a harsh environment (Marine, Industrial, Desert). The selection of the coating material to be used to protect these structures from the environment is very important. Zinc coating, and especially inorganic zinc coating with its unique way of protecting, is one of the most effective coatings to be used in years.The industrial atmosphere with its high level of pollution, is very corrosive, and relapses in the metal form its highly reactive substance to steady state substance (corrosion). An acidic environment, especially H2SO4 and HCl has concerned scientists and coating producers fpr, many years, because they lead to a very rapid attack of steel and other material. According to Zinc Institute, Inc, the corrosion rate of steel when it is exposed for two years in an industrial environment was 14 g and 37.7g in a seacoast industrial, while zinc showed a better resistance to the same environment with about 0.54g and 2.11g respectively1. Zinc as a metal performs better in a mild environment with a pH between 6 and 10.5.Sulfuric acid, which might form from SO2 and So3 gases when they react with water, is abundant especially in petroleum fields near refiners. Hydrochloric is presented out-doors in reduced concentrations when compared with So2. The major natural sources of HCl are from volcanic fumaroles, atmospheric transformation of chlorinated hydrocarbons, emission from waste incineration specially PVC and chlorinated solvent and emission from burning of deep mined coal. Keywords: corroded surface, top coating, flowline corrosion, subsurface corrosion, society of petroleum engineers, upstream oil & gas, riser corrosion, fractal dimension, well integrity, thickness Subjects: Pipelines, Flowlines and Risers, Materials and corrosion, Well Integrity, Subsurface corrosion (tubing, casing, completion equipment, conductor) This content is only available via PDF. 2001. Society of Petroleum Engineers You can access this article if you purchase or spend a download.

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