Prevention of Corrosion by Inorganic Zinc Coating on Petroleum Product Carrier by Shoji Ohnishi, Member Summary There are many comparatively small oil

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1 Prevention of Corrosion by Inorganic Zinc Coating on Petroleum Product Carrier by Shoji Ohnishi, Member Summary There are many comparatively small oil tankers carrying clean products of petroleum or petrochemicals. Recently, the sizes of these product carriers are being apt to become larger type due to the need in the world wide petroleum situation. Internal tank surfaces of this carriers are exposed to severe corrosive environment such as high solubility Hydrocarbons, rolling and moving ballast water, high temperature condition of Butterworth cleaning and corrosive moisture contaning active sulfur compound. Pitting or local corrosion may occur attacking on unprotected internal tank structure and corrosion products often causing cargo contamination and pump trouble. Method for preventing these corrosion is very difficult and expensive, cathodic protection, use of organic inhibitor in cargo or water, clud of stainless steel or lining of Fiber Reinforced plastics etc. are not so perfect every time and difficult to apply. Protective coating of Inorganic Zinc Silicate is comparatively economical and considered to be endurable against clean cargoes and seawater ballast. We hereby report the results investigated on the durability of Inorganic Zinc coating to clean products and contamination of cargoes.

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3 Table 1 Weight of Zinc Compounds Precipitated in Salt Water by Cyclic Immersion test

4 Fig. 1 Correlation between Weight Change of Inorganic Zinc Coating and Immersed Time in Kerosene Fig. 2 Correlation between Weight Change of Inorganic Zinc Coating and Immersed Time in Toluene

5 Fig. 3 Correlation between Weight Change of Inorganic Zinc Coating and Immersed Time in Alcohols Fig. 4 Correlation between Weight Change of Inorganic Zinc Coating and Immersed Time in Polyethylene Glycohol Fig. 5 Correlation between Weight Change of Inorganic Zinc Coating and Immersed Time in Ketones Fig. 6 Correlation between Weight Change of Inorganic Zinc Coating and Immersed Time in Aviation Fuels

6 Table 3 Neutralization Number of Jet Fuels3) Fig. 7 Effect of Oil Acidity on Zinc Pick Up Fig. 8 Effect of Oil Soluble Zinc Naphthenate on Jet Fuel Quality

7 Table 4 Aviation Fuel Quality-Effect of Transportation Data from Esso Research & Engg. Co. Table 5 Zinc Pick up in Acidic Hydrocarbons, Evaluated by Laboratory Cyclic Test Simulated Tanker Voyage Conditions Area of Zinc Coating/Volume of Hydrocarbon=1 sq. in./0. 8 qts = 0. 7 m2/1 m 3 =typical tanker condition Test cycle : Immersed in Hydrocarbon (24 Ž) 9 dayshot water rinseimmersed in sea water, 2 dayssalt fog for 3 days Hydrocarbon immersion, (Esso's standard screening test for evaluating the relative resistance of tank coatings. )

8 Fig. 9 Effect of Oil Acidity on Zinc Pick Up, Comparison of Test Data BUTTER WORTH CONDITION Fig. 10 Test apparatus for Butterworth Cleaning and Test Condition

9 Table 6 Butterworth Cleaning Test on Zinc Rich Coating Condition of cyclic test (Immersed in sea water (R. T.) for 3 or 7 days) (Immersed in Heavy oil (R. T.) for 3 or 7 days ) Butterworth cleaning (at 60 or 85 C) 30 or 75 min each Total time of Butterworth was 5 hrs Total duration of test was 33 days

10 I MME_RSED TIME Fig. II Appearance of Epoxy Coating Immersed in Caustic Soda Soln. of 60% IMMERSED TIME Fig.12 Appearance of Epoxy Coating Immersed in Acidic. Vegitable Oil at Various Temperature (FFA 10% as Oleic Acid ) IMMERSED Ti ME Fig. 13 Appearance of Epoxy Coating Immersed in Water at 40 C

11 Table 7 Rate of Water Absorption on Various Epoxy Resines7) (Japan Ciba Geigy), (Feb. 1973, Vol. 13 ) Table 8 Result of Water Transfer Test on Film of Various Coatings *) Data from Shell Thornton Research Center

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