ABSTRACT
This chapter presents observations of corrosion damages not included in Chapters 3 and 4. It first covers the effect of stress on the corrosion and degradation of mechanical properties of corroded steel. The stress effect is different to stress corrosion cracking but is applied to steel simultaneously with corrosion. Then preferred corrosion is presented, which includes the causes of preferred corrosion and the factors that affect preferred corrosion. Some suggestions to prevent preferred corrosion are also proposed. One of the most severe damage of corrosion to steel is preferred corrosion-induced delamination of steel, which is covered in detail in this chapter with simulated corrosion tests, qualification of delamination and analysis of microstructural changes. Hydrogen embrittlement is another severe form of corrosion damage, which is covered in this chapter as well, including measurement on hydrogen concentration, effect of hydrogen concentration on tensile properties of corroded steel and the mechanism for hydrogen embrittlement.
