Accession Number:

AD0684073

Title:

MARINE CORROSION STUDIES: THE CORROSION CHARACTERISTICS AND RESPONSE TO CATHODIC PROTECTION OF SEVERAL STAINLESS STEEL ALLOYS IN QUIESCENT SEA WATER; WITH A PARTIALLY ANNOTATED BIBLIOGRAPHY.

Descriptive Note:

Interim progress rept. no. 6,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Report Date:

1968-11-01

Pagination or Media Count:

52.0

Abstract:

Crevice corrosion was the most serious type of attack found on unprotected stainless steel, but random pitting not associated with any observed crevice was also found. Stainless steel alloys 21Cr-6Ni-9Mn, 17-4 PH H1025, 205, 304, 316, 410, and 430 were seriously attacked by crevice corrosion. Stainless No. 20CB-3 was much more resistant to this type of attack but was not completely immune. Cathodic protection from either carbon steel or aluminum anodes effectively reduced the crevice corrosion on the stainless steels studied, but in some cases the steel anodes were not effective in reducing the depth or incidence of random pitting. Aluminum anodes are judged unsuitable for use on 17-4 PH H1025 stainless steel as this level of cathodic protection caused accelerated cracking of this alloy. Additional studies on cathodically polarized 17-4 PH stainless steel aged at 925F for 4 hours indicated a considerable reduction in the load-bearing capacity of a precracked specimen when it was polarized to the potential of a zinc or aluminum anode. Author

Subject Categories:

  • Properties of Metals and Alloys
  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE