Erosion—Corrosion of Metals and Alloys

Effects of pH and Velocity on Corrosion of Steel Water Pipes

“…It was found that in some cases the short-term test results were completely different from long-term effects. Figure 4 shows the similar to those obtained by Fontana and Luce (7) and Groesbeck and Waldron (6), and to the authors' own preliminary short-term tests. On the other hand, the curves obtained by plotting the 30-40-day corrosion rates are in good agreement with the generally accepted theories of Whitman and associates (4).…”

“…In the Groesbeck and Waldron studies, the corrosion rate was higher at pH 7.0 than at pH 5.5. Fontana and Luce (7) reported similar re-the effect of velocity should be to in. crease corrosion due to increasing dif, fusion of oxygen and the breaking down of protective films on the metal surfaces.…”

Effects of Velocity on Corrosion by Water

“…Fontana and Luce (17) studied the erosion corrosion of steel in water in some laboratory tests. As might be expected they found that the amount of damage was affected by the aeration and by the pH of the water.…”

Wrought Copper and Copper-Base Alloys

“…The effect of 0.75% iron in an alloy containing 90% copper, 10% nickel, was particularly good; this alloy was superior to an alloy containing 92% copper and 8% tin. Fontana and Luce (53) in a series of erosion-corrosion tests of metals and alloys showed that the corrosion resistance of an alloy containing 70% copper and 30% nickel and 0.12% iron was increased threefold when the iron content was increased up to 0.59%. Tests described by Mills (108) extending over a period of 21.5 months in a turbine oil cooler showed that an alloy containing 89% copper, 10% nickel, and 0.8% iron had marked resistance to corrosion by sea water as drawn from the Corpus Christi ship channel.…”