Search Results for hot corrosion

Fig. 9 Effect of cobalt on hot corrosion; modified Udimet 700, 170 1-h cycles at 900 °C (1650 °F), with 0.5 ppm by weight Na as NaCl, Mach 0.5 More

Fig. 8 Types of sustained hot corrosion of a pure metal. Site I is the oxide-salt interface, and site II is the salt-gas interface. Source: Ref 15 More

Fig. 11 The role of chromium in inhibiting hot corrosion attack More

Fig. 16 Ni-20Cr-2ThO 2 after simulated type I hot-corrosion exposure (coated with Na 2 SO 4 and oxidized in air at 1000 °C, or 1832 °F). A, nickel-rich scale; B, Cr 2 O 3 subscale; C, chromium sulfides. Courtesy of I.G. Wright, Battelle Columbus Division More

Fig. 11 Hot corrosion attack of René 77 nickel-base alloy turbine blades. (a) Land-based, first-stage turbine blade. Notice deposit buildup, flaking, and splitting of leading edge. (b) Stationary vanes. (c) A land-based, first-stage gas turbine blade that had type 2 hot corrosion attack. (d More

Fig. 11 Degradation of rupture for Udimet 500 due to hot corrosion at 705 °C (1300 °F) More

Fig. 21 Effects of fuel carbon residue (10% bottoms) on type II hot corrosion of nickel aluminide high-temperature coatings. Source: Ref 135 More

Fig. 23 Effect of molten salt on hot corrosion at 700 °C (1290 °F) in air. With the lower melting temperatures of salt mixtures, the corrosion rate increases with increasing volume fraction of liquid. Courtesy of Z. Tang and B. Gleeson, University of Pittsburgh More

Fig. 21 (a) Type I hot corrosion at a blade tip IN-738 alloy. Note the subsurface sulfides (arrows). (b) Type II hot corrosion attack of a blade shank (below the platform) CMSX-4 (single-crystal) alloy. The sample was etched with Marble’s reagent to show the lack of alloy depletion under More

Fig. 28 Severe attack of an aeroderivative gas turbine blade by hot corrosion. See the article “Corrosion of Industrial Gas Turbines” in this Volume. More

Fig. 66 Hot corrosion of alloys MA 953, HDA 8077, and MA 956 compared to that of some non-ODS alloys. Test conditions: 900 °C (1650 °F), 1 h, followed by a 3 min air blast, 5 ppm sea salt. Source: Ref 46 More

Fig. 8 Examples of engine component surface damage. (a) Evidence of hot corrosion damage on the pressure side of a MAR-M-246 turbine blade. (b) Metallographic section across the airfoil of the MAR-M-246 blade, showing evidence of hot corrosion damage penetrating the leading edge (B) right More

Fig. 5 Severe attack of an aeroderivative gas turbine blade by hot corrosion More

Fig. 6 Type I high-temperature hot corrosion. D is the external deposit, which also contains oxidation products. O is the internally oxidized metal. S is the layer of sulfides. B is the base metal. As-polished More

Fig. 7 Type II low-temperature hot corrosion, showing the layered appearance of the scale. As-polished More

Fig. 8 Degradation in rupture life for various superalloys due to hot corrosion at 705 °C (1300 °F) More

Fig. 8 Corrosion losses of hot dip coatings in the industrial environment of Bethlehem, PA. Source: Ref 18 More

Fig. 2 Corrosion losses of hot-dip coatings in the industrial environment of Bethlehem, PA More

Fig. 16 Corrosion of hot water line after insulation was degraded by water intrusion. See the article “Corrosion Control for Military Facilities” in this Volume. More

Fig. 2 Corrosion losses of hot dip coatings in the industrial environment of Bethlehem, PA. Source: Ref 13 More