STP1000

    Application of the Critical Pitting Temperature Test to the Evaluation of Duplex Stainless Steel

    Published: Jan 1990


      Format Pages Price  
    PDF (220K) 14 $25   ADD TO CART
    Complete Source PDF (11M) 14 $118   ADD TO CART


    Abstract

    This paper presents the results of a laboratory testing program whose objective was to evaluate the localized corrosion resistance of duplex stainless steel weldments and to validate screening test methods for this task. The results of sodium chloride (NaCl) critical pitting temperature (CPT) tests, ferric chloride tests, electrochemical polarization (pitting) scans, and simulated service environment tests are presented. These studies revealed that the sodium chloride CPT screening test provided the best correlation with long-term simulated service environment tests in terms of rank ordering resistance to pitting and in the morphology of attack. In terms of pitting resistance of duplex stainless steel weldments, it was found that pitting susceptibility could be related to both ferrite content and pitting index (PI) of the weld metal. At equivalent values of PI and ferrite content, the weld metal had higher resistance to pitting than the base metal.

    Keywords:

    corrosion testing, localized corrosion, pitting, duplex stainless steel, welding, critical pitting temperature, microstructure, electrochemistry


    Author Information:

    Kane, RD
    Cortest Laboratories, Inc., Cypress, TX

    Wilhelm, SM
    Cortest Laboratories, Inc., Cypress, TX

    McIntyre, DR
    ARAMCO, Dhahran,


    Paper ID: STP39196S

    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP39196S


    CrossRef ASTM International is a member of CrossRef.