Prevention of Corrosion

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Presentation transcript:

Prevention of Corrosion

type 1 Cathodic Protection

Cladding Method: bonding layers of the aluminum alloy Examples: so-called rolled gold, which consists of a brass or steel core with a layer of gold on the outside

Galvanizing Method: coating a base metal, such as iron or steel, with a thin layer of zinc to protect the base metal from corrosion Advantage: Zinc is applied with greater ease and lower cost

Similarities find a lower metal on the Reduction Table in order to react before the Fe does

Cathodic Protection " a metal lower on the Reduction Table (higher oxidation potential ) is attached to or brought near to the Fe" ------------Chemistry 12 Notes on Unit 5-Redox

Some common examples of Cathodic Protection Mg stainless steel

type 2

Ceramic Materials Method: coat metal with ceramic enamel Advantage: harder, better corrosion resistance

cover materials to the metal, prevent the contact of the metal, oxygen, and moisture

type 3

Impressed current a coltage is applied with an external power supply to keep the Fe slightly negative. Thus, the Fe surface has excess e-s so it doesn't have to oxidize in order to supply e-s to O2 ------------------P55 of the note