By Einar Mattson

This elementary survey of the corrosion of metals doesn't require a deep wisdom of chemistry, yet acts as a useful compendium of obtainable info at the sorts of corrosion, electrochemical ideas, environments and techniques of safety and prevention, in addition to concepts for extra info.

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29). 5 SELECTIVE CORROSION Selective corrosion (also known as dealloying) can be found in alloys and results from the fact that the components of the alloy corrode at different rates. 4) (Fig. 30). On dezincification the zinc is dissolved selectively, while the copper is left as a porous mass having poor structural strength. Similar corrosion processes include the dealuminisation of aluminium bronze and the selective dissolution of tin in phosphor bronze. Graphitic corrosion in grey cast-iron provides another example of selective corrosion where the metallic constituents of the iron are removed (Fig.

Propagation implies the growth of the crack and can result in fracture or in repassivation. In the latter case the process is stopped. The mechanisms vary with the material and the corrosion conditions. e. passing right through the crystal grains, or intergranular, localised at the grain boundaries (Fig. 38). The cracks can cause the piece of material to break. Stress corrosion cracking is characterised by brittle fracture. This implies that no contraction takes place at the place of rupture as with a ductile fracture (Fig.

16 and 17 it is shown how the potential-pH diagram for copper is changed, when water receives additions of sulphate and sulphate + ammonia respectively. 2 ELECTROCHEMICAL AND CHEMICAL CORROSION Many corrosion processes are, in the widest sense of the expression, electrochemical in nature, because they involve an oxidation reaction: In spite of this one can distinguish between: electrochemical corrosion, which takes place via electrode reactions, usually in a moist environment (corrosion in aqueous solutio-s-us is included here, and atmospheric corrosion under the influence of moist films on the surface as well as corrosion in soil aided by moisture), and chemical corrosion, which takes place under the influence of dry gases (for example high temperature oxidation) or water-free organic liquids.

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