The ocean going ship plays a vital role in our economy by transporting both dry and fluid raw materials at low cost per ton-mile. An integral part of this cost consideration lies in the service life of the vessel which, in turn, is dependent to a large extent on the success of measures adopted to protect against corrosion. In some cases the cargoes themselves present corrosion problems because of their aggressive nature. This may mean special alloys or coatings. In every case, however, the vessel is subject to the ravages of the salt water to which it is continually exposed. It is essential therefore that the hull, particularly the underwater area, be properly protected.
In commercial practice, reliance is placed on building up a protective barrier of paint during the early life of the ship. This may mean a dozen or more coats of paint. In this respect, since conditions...
