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Their unique characteristics for being corrosion and high temperature resistant materials do not exclude them from the corrosion schemes. Some strong acids are the cause of ceramic oxidation. The oxidation of polymers is represented by a molecular anodic reaction of the form This implies that the polymer R loses one electron leading to a degradation known as depolymerization. In addition, woods also degrade in strong acids and alkalies. 11 REFERENCES [1] P. L. A. T. Burstein, Butterworth-Heinemann, 20(1959)15.

In general, dislocations are linear defect, which can act as high energy lines and consequently, they are susceptible to corrode as rapidly as grain boundaries in an corrosive medium. 12 illustrates dislocation networks in an AISI 304 stainless steel and in RSA The relevant pretreatment conditions can be found elsewhere [19]. 12b, there is a clear grain boundary shown as a dark horizontal line across the upper part of the TEM photomicrograph. The small white areas surrounded by dislocations are called sub-grains, which are crystal having an FCC structure for both alloys.

8 CHAPTER 1. FORMS OF CORROSION STRESS CORROSION CRACKING Structural parts subjected to a combination of a tensile stress and a corrosive environment may prematurely fail at a stress below the yield strength. This phenomenon is known as environmentally induced cracking (EIC), which is divided into the following categories: stress-corrosion cracking (SCC), hydrogen-induced cracking (HIC) and corrosion-fatigue cracking (CFC). These three categories can develop under the influence of an applied potential related to polarization diagram.

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