Five examples of boiler tube failures caused by corrosion are discussed and illustrated with figures. Iron migration theory is briefly covered. Recent data on boiler corrosion are given to show that old theories may need modification to consider the corrosive factors presented by higher temperatures and greater pressures in boiler operations. The implication is made that corrosion can occur in boiler tubes despite the use of chemicals in boiler water. Two chemical methods of corrosion control are discussed: control of alkalinity and acid cleaning. The conclusion is made that under certain operating conditions periodic acid cleaning of boilers is essential if tube failures are to be avoided. 7.6.4.
Subject
Acids,
Water,
Iron oxide,
Corrosion rate,
Oxide formation,
Tubes,
Oxide layers,
Iron,
Metals,
Heat,
Boilers,
Oxygen,
Deposit corrosion
Copyright 1958 by the National Association of Corrosion Engineers.
1958
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