The relationship between relative oxide ion content of Na2SO4, the presence of liquid metal oxides and sulfidation attack

Bornstein, N. S.; DeCrescente, M. A.; Roth, H.

doi:10.1007/bf02665406

Cited by 43 publications

(21 citation statements)

References 7 publications

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“…However, as in the case of the additive, the mode of attack was not altered. 4. Intermittent water washing of test specimens to remove soluble salt deposits had only a small and variable effect on hot corrosion.…”

Section: Discussionmentioning

confidence: 97%

Effect of a chromium-containing fuel additive on hot corrosion

Lowell

Deadmore

1978

Corrosion Science

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Four cast superalloys (one cobalt-base and three nickel-base) were tested to 9000 C for one hundred hours in Mach 0.3 combustion gases.Five parts per million of synthetic sea salt were added to the gases in the combustion chamber. Several types of thermal cycle and washing procedures were employed. Similar tests were nade with the addition of M co 300 parts per million of a chromium-containing fuel additive. In both co W sets of tests the extent of hot corrosion was evaluated by specific weight change and metal recession. In general, the chromium additive in the fuel reduced the extent of hot (salt) corrosion but did not eliminate it. The percent reduction of hot corrosion attack was similar for all four alloys.As great a reduction of hot corrosion was achieved by reducing the number of thermal cycles during the test from 100 to five or six. The effect of washing the alloys every ten cycles as opposed to the end of the test was erratic; some alloys were attacked slightly more, others somewhat less.A NiCrAlY coating was found to be more effective in reducing hot corrosion than either the fuel additive or the washing schedule.

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Section: Discussionmentioning

confidence: 97%

Effect of a chromium-containing fuel additive on hot corrosion

Lowell

Deadmore

1978

Corrosion Science

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“…NaVO 3 acts as a catalyst and also serve as an oxygen carrier to the bare superalloy through the open pores present on the surface, which leads to the rapid oxidation of the substrate elements and form non protective scales [38][39][40][41][42]. Hence, an increase in the mass gain of the bare superalloy occurs during hot corrosion.…”

Section: Hot Corrosion Mechanismsmentioning

confidence: 98%

Microstructural Characterization and Cyclic Hot Corrosion Behaviour of Sputtered Co–Al Nanostructured Coatings on Superalloy

et al. 2011

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Nanostructured Co-Al coatings on Superni-718 superalloy substrate were deposited by DC/RF magnetron sputtering in the present work. The microstructure and cyclic hot-corrosion behavior of nanostructured Co-Al coatings on Superni-718 superalloy were investigated in molten salt of 40 wt% Na 2 SO 4 ? 60 wt% V 2 O 5 at 900°C. The results showed that a dense scale formed on the coated samples exposed to corrosive environment during thermal cycling. The spinel phases of CoCr 2 O 4 , CoAl 2 O 4 and NiCr 2 O 4 were found in the corroded scale of the coatings, resulting in an effective inhibition of O and S diffusion. The sputtered Co-Al coatings exhibited high hot corrosion resistance due to the formation of b-CoAl phases in the coating. The relevant corrosion mechanisms substantiating the role of coatings are discussed.

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“…When the molten Na 2 SO 4 -K 2 SO 4 is present during the hot corrosion, the molten salt penetrates the initially formed oxide scale through defects and reaches the scale/alloy interface, where SO 2− is reduced by the following chemical equilibrium [20][21][22][23][24]:…”

Section: Hot Corrosionmentioning

confidence: 99%