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

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)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1969
Accession Number
AD0686651

Entities

People

  • M. C. Bloom
  • Somers H. Smith Jr

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Boilers
  • Corrosion
  • Feed Water
  • Films
  • High Pressure
  • High Temperature
  • Hydroxides
  • Iron
  • Metals
  • Oxide Films
  • Oxides
  • Sodium
  • Sodium Hydroxide
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Tubes
  • Water

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Systems Analysis and Design
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).