WADC-TR-52-100
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- March 7, 2017 Create Date
- March 7, 2017 Last Updated
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Wright Air Development Center - Improvement of Jet Engine Descaling Procedure
X—ray diffraction analyaiø of the Inconel øcale on combuetion tube inner i iner• revealed that it composed of nickel oxide, the major and lesser amounte of chromium oxide and iron oxide. Metallographic examination denonetrated that heavy "ale aegociated with precipitation, poeøibly car— bide. at the grain boundaries, a fact which can explain intergranular corrosion of scaled Inconel in acid eoiutionø. Inconel scale could not be taken off in neutral or alkaline golventB but several acid solutionø were found remove most of the ecale vithout •eriouø— attacking the baee metal. Oxidizing pretreatments, particularly vith the alkaline permanganate solution in current uge by the Air Force, were ebon to promote efficient acid pickling. Physical teats of Inconel epeeimenø deøcal•d With the nitric acid—ferric chloride eoiution that high tuperatare pickling (1600F) caueed a severe logs In tensile øtr.ngth whereas room temperature pickling cau•ed no appreciable 108B in tensile strength. full test Of the nitric acid—ferric chloride solution vas perform— ed at Norton Air Force Ban. San Bernardino, and •atißfactory reøu1tB Vere ach eyed.
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