Corrosion resistance of inconel 690 to borax, boric acid, and boron nitride at 1100{degrees}C

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Significant general and localized corrosion was observed on Inconel 690 coupons following exposure to borax, boric acid and boron nitride at 1100{degrees}C. Severe localized attack at and below the melt line was observed on coupons exposed to borax. An intergranular attack at and below the melt line was observed on coupons exposed to borax. An intergranular attack (IGA) of the Inconel 690 was also observed. Severe internal void formation and IGA (30 mils penetration after 3 days) was observed in the coupon exposed to boric acid. Both borax and boric acid remove the protective chromium oxide; however, this layer can ... continued below

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Imrich, K. J. December 12, 1996.

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Significant general and localized corrosion was observed on Inconel 690 coupons following exposure to borax, boric acid and boron nitride at 1100{degrees}C. Severe localized attack at and below the melt line was observed on coupons exposed to borax. An intergranular attack at and below the melt line was observed on coupons exposed to borax. An intergranular attack (IGA) of the Inconel 690 was also observed. Severe internal void formation and IGA (30 mils penetration after 3 days) was observed in the coupon exposed to boric acid. Both borax and boric acid remove the protective chromium oxide; however, this layer can be reestablished by heating the Inconel 690 to 975 {degrees}C in air for several hours. Inconel 690 in direct contact with boron nitride resulted in the formation of a thick chromium borate layer, a general corrosion rate of 50 to 90 mils per year, and internal void formation of 1 mil per day.

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OSTI as DE97008654

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  • Other Information: PBD: 12 Dec 1996

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  • Other: DE97008654
  • Report No.: WSRC-TR--96-0394
  • Report No.: SRT-MTS--96-2054
  • Grant Number: AC09-89SR18035
  • Office of Scientific & Technical Information Report Number: 522764
  • Archival Resource Key: ark:/67531/metadc694365

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  • December 12, 1996

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 9, 2016, 8:03 p.m.

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Imrich, K. J. Corrosion resistance of inconel 690 to borax, boric acid, and boron nitride at 1100{degrees}C, report, December 12, 1996; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc694365/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.