Based on inspection of more than a thousand tanker cargo compartments, types of corrosion are classified under four operating conditions. These are the presence or absence of ballast water and petroleum material cargoes of low or high viscosity. Pitting in crude tankers is explained as simple galvanic corrosion. Data and experience with successful cathodic protection systems using magnesium and zinc anodes are discussed. At present the zinc systems appear to be the more economical. Data are presented showing that appreciable hydrogen is generated by magnesium systems but not by zinc systems. The benefits of fresh water rinsing are indicated by test panel data and from inspections.
5.2.2, 8.9.5
© 1961 National Association of Corrosion Engineers
1961
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