On the Boiler Tube Corrosion

Nakazawa, Osamu; Onimura, Kichiro

doi:10.2472/jsms.13.517

Cited by 2 publications

(1 citation statement)

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“…9 Some failures in high pressure boilers have been attributed to caustic corrosion. [11][12][13] . -On the other hand, solutions of low pH value may be generated in boilers and thus cause acidic corrosion.…”

Section: Introductionmentioning

confidence: 99%

Failure of Boiler Tubes in Power Plants

Gouda¹,

Nassrallah²,

Sayed³

et al. 1981

British Corrosion Journal

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In-servicefailures of boiler tubes from different locations in the combustion chamber of Cairo West Power Station have been investigated. Metal/ographic, chemical and mechanical tests were carried out on thefailed tubes. Metal/ographic inspection indicated that some of the tubes investigated showed intergranular stress corrosion cracking and others showed matrix embrittlement. A few -of the tubes were ruptured by tensile fracture as a result of metal thinning due to localised overheating and/or severe corrosion. Metallic Cu and/or Cu compounds were observed within the failed part of most of the tubes. Deposits if present were dark, heavy and poorly adherent. They were composed mainly of iron oxide with other minor constituents, mainly other oxides. However, in two tubes the deposit was essentially composed of metallic copper. Chloride and hematite were detected in the scales of afew tubes.The evidence indicates that the failure was most probably due to several factors: localisation of concentrated alkaline solutions, in-leakage of O 2 and Cu 2 +, and the presence of local and/or applied stresses.

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Section: Introductionmentioning

confidence: 99%