The Corrosion Resistance of Ductile Iron★

Abstract

The internal structure of ordinary grey iron, pearlitic ductile iron, ferritic ductile iron, malleable iron and mild steel are compared. Differences in the amount of carbon present and in the form in which it occurs are responsible for some differences in the corrosion behavior of these materials. This is explained on the basis of the electrochemical reactions which occur during corrosion. As corrosion proceeds, the graphite which is present in the cast materials may accumulate as a graphitic layer on the surface. The adherence and permeability of such graphitic layers and their influence on subsequent corrosion and on galvanic behavior are discussed. Corrosion data in acids, in neutral and alkaline solutions, in sea water, in the atmosphere and underground, in miscellaneous environments, and under conditions involving erosion are presented and interpreted in the light of the principles outlined above. By and large, it is concluded that ductile iron has satisfactory corrosion resisting properties which permit its use where grey iron, malleable iron, or steel are regularly employed. 6.2.2

Anodic Dissolution of Spheroidal Graphite Cast Iron with Different Pearlite Areas in Sulfuric Acid Solutions

“…Laque reported that the corrosion rate of cast irons is lower than that of a steel in the atmosphere above the sea [2]. However, Paris and Bruniere [1] and Horikawa et al [10] found that the corrosion rate of cast irons is nearly equal to that of steel in water and in atmosphere.…”

“…The objective of the present investigation is to determine the kinetic parameters and the rate equation of anodic dissolution reaction of spheroidal graphite cast iron having different areas of pearlite in sulfuric acid solutions. The ratios of the pearlite area, , the graphite particles area, , and the ferrite area, , are defined by (1), (2), and (3), respectively. Figure 1, was used for casting.…”

“…A lot of experimental studies of cast iron for practical use were conducted [1][2][3][4][5][6][7][8]. A form of corrosion unique to cast irons is a selective leaching attack commonly referred to as graphitic corrosion [9, page 89].…”

Investigating in-service failures of water pipes from a multiaxial notch fatigue point of view: A conceptual study

“…Accordingly, the pit growth rate in such circumstances tends to decrease as the soil resistivity increases [23].…”

Hydrogen Evolution Reaction on Spheroidal Graphite Cast Iron with Different Graphite Areas in Sulfuric Acid Solutions

“…A lot of experimental studies of cast iron for practical use were conducted. [2][3][4][5][6][7][8][9] However, few reports on the basic corrosion mechanism of cast iron have been published. To elucidate mechanisms of corrosion of cast iron, intensive studies on each process are important.…”