Mechanically assisted corrosion

The second part of the book consists of two chapters namely the forms of corrosion and practical solutions. The chapter, Forms of Corrosion consists of a discussion of corrosion reactions, corrosion media, active and active-passive corrosion behavior, the forms of corrosion, namely, general corrosion, localized corrosion, metallurgically influenced corrosion, microbiologically influenced corrosion, mechanically assisted corrosion and environmentally induced cracking, the types and modes of corrosion, the morphology of corroded materials along with some published literature on corrosion. 

Therefore, the seventh edition no longer includes these endless tabulations of data rather, there is an extensive coverage of corrosion mechanisms, the manner in which these various factors effect the corrosion system, as well as more detail as to the testing protocol necessary to assist in a sound MOC selection. 

Figure 6.34 Some corrosion types of mechanically assisted degradation3...

Marcus, P., Sulfur Assisted Corrosion Mechanisms and the Role of Alloyed Elements, Corrosion Mechanisms in Theory and Practice, P. Marcus, J. Oudar (eds.), Marcel Dekker, NY, pp. 239-263, 1995. 

Mechanically assisted degradation can consist of the following types of corrosion erosion-corrosion, water drop impingement corrosion, cavitation erosion, erosive and corrosive wear, fretting corrosion, and corrosion fatigue (CF) (Fig. 1.14). Erosion-corrosion consists of the corrosion process enhanced by erosion or wear. Fretting corrosion consists of the wear process enhanced by corrosion. CF consists of the combined action of fluctuating or cyclic stress and a corrosive environment. 

Figure 1.14 Corrosion types of mechanically assisted degradation. (Reproduced with permission of NACE International from Reference 3.)...

Marcus P. Sulfur-assisted corrosion mechanisms and the role of alloyed elements, in Marcus P, editor. Corrosion Mechanisms in Theory and Practice, 2nd Ed., Marcel Dekker, New York, 2002 287-310. 

This book covers a wide spectrum of corrosion topics with rich illustrations, an easy to understand writing style, and the presentation of review articles, providing state-of-the-art corrosion-mitigation techniques useful for practicing engineers, technologists, and field technicians. It also provides a basic understanding of corrosion mechanisms, which will be equally beneficial to people who are not directly involved in the corrosion field to assist them in their related tasks. Based on its content and presentation of scientific and technical issues, this... 

It should be pointed out here that corrosion processes often involve multiple conjoint effects. Rarely does a single mechanism or event drive corrosion rather, a number of events combine to produce severe effects. Thus, we must keep in mind that corrosion processes usually occur in the context of other factors (loads, wear, crevices, temporally and spatially varying environments, etc.). One such combination of factors can lead to mechanically assisted corrosion in total hip replacements ... 

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