...Initiation and Propagation of Stress-Assisted Corrosion Waterside corrosion of boiler tubes occurs where chemical dissolution or mechanical fracturing of the magnetite film exposes bare steel. ¹⁰ Tensile stresses in the steel exposed by a crack in the magnetite film tend to accelerate...

... be used to evaluate sour corrosion resistance. The occurrence of competing damage mechanisms in the 4PB specimens introduces complexity when examining the specimen post-test, especially when the surface damage features exhibit geometrical traits of both pits and cracks. Stress-Assisted Corrosion The pits...

...Abstract Tube damage due to stress-assisted corrosion (SAC, or Corrosion Fatigue) is relatively common in recovery boilers. Another damage mechanism, known as “phosphate hideout,” has been attributed to under-deposit corrosion in high-pressure boilers. Phosphate hideout is characterized...

... can be fixed or cyclic. Stressed surfaces are more susceptible to cracking and corrosion (stress-assisted corrosion). Sudden longitudinal expansion or contraction of the waterwall tube causing brittle fracture of the protective oxide coating. Where the oxide is ruptured, oxide rapidly reforms...

...Stress-assisted corrosion (SAC) is a term given to a particular manifestation of waterside corrosion of steel boiler tubes that seems to result from a combination of stress and corrosion, particularly during periods (such as shutdowns) in which the water chemistry within the tubes can be relatively...

... are provided. Corrosive environments and possible stresses that led to failures are discussed. Stress-assisted corrosion waterwall tube economizer tube HRSG superheater header INTRODUCTION The term stress-assisted corrosion (SAC) is used to describe selective corrosion attack triggered by high localized...

... of areas where the normally smooth and uniform oxide film seemed somewhat rough/graveled with scattered debris (discussed more below). Abstract Stress-assisted corrosion (SAC) was observed on the waterside of mild steel recovery boiler tubes only at locations exhibiting the combination of a substantial...

...Abstract Waterside fissures that form in the vicinity of weld attachments in boiler tubing are a problem in the paper industry, particularly in kraft recovery boilers where water leaks pose a serious safety hazard. This type of damage is generally called stress-assisted corrosion (SAC...

...Soon after the Missoula explosion, the Foley, FL (Procter and Gamble) mill found severe stress-assisted corrosion and developed radiographic procedures to quantify it. These methods were presented at the 1990 TAPPI Engineering Conference and published the following year ( 8 ). Sutton, Barna...

...Abstract Stress-assisted corrosion refers to attack at locations where applied and/or residual stresses are imparted to the metal. Case histories are presented from a variety of different boiler systems that illustrate the effects of stress-assisted corrosion, including environmental conditions...

... Blanketing Departure From Nucleate Boiling (DNB) Stress-Rupture Stress-Assisted Corrosion Corrosion Fatigue INTRODUCTION Increasing demands for boiler efficiency, adaptability requirements for varying loads, and cycling duties, either experienced or anticipated, by many of today's steam generation...