Accession Number:

AD0686651

Title:

THE CORROSION PRODUCTS OF IRON AND THEIR RELATION TO CORROSION IN STEAM- GENERATING EQUIPMENT.

Descriptive Note:

Interim rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

Report Date:

1969-04-01

Pagination or Media Count:

16.0

Abstract:

The possibility of avoiding serious pitting in the generating tubes of naval boilers depends on the genesis and preservation of proper corrosion product films. The spinel films Fe3O4 normally produced as a result of exposure to slightly alkaline sodium hydroxide solutions are protective but porous to the solution. Reaction at the metal surface beneath these films may give rise to drastic concentration effects under some operating conditions. When films formed become too thick as a result of such concentration effects, they may fracture, allowing free access of the solution to the metallic surface at a local spot beneath the fractured film with resultant danger of deep pitting. There is evidence that the use of lithium hydroxide instead of sodium hydroxide avoids this concentration effect. Author

Subject Categories:

  • Properties of Metals and Alloys
  • Air Conditioning, Heating, Lighting and Ventilating

Distribution Statement:

APPROVED FOR PUBLIC RELEASE