Weldability of Fe-Al-Cr Overlay Coatings for CorrosionProtection in Oxidizing/Sulfidizing Environments

Technical Report · Tue Mar 04 04:00:00 EST 2003

DOI:https://doi.org/10.2172/885600· OSTI ID:885600

Regina, JR

The effect of chromium additions to the weldability of Fe-Al based overlay claddings are currently being investigated for the corrosion protection of boiler tubes in Low NOx furnaces. The primary objective of this research is to identify weldable (crack-free) Fe-Al-Cr weld overlay coating compositions that provide corrosion resistance over long exposure times. During the current project phase, preliminary corrosion testing was conducted on several ternary Fe-Al-Cr alloys in two types of gaseous corrosion environments. These long-term corrosion tests were used to develop a target weld composition matrix and serve as a base line for future corrosion tests. Preliminary Fe-Al based welds with various aluminum concentrations and one ternary Fe-Al-Cr weld overlay were successfully deposited using a Gas Tungsten Arc Welding (GTAW) process and cracking susceptibility was evaluated on these coatings.

• Research Organization: ORNL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 885600
• Report Number(s): ORNL/SUB/95-SU604/05
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ALUMINIUM
BOILERS
CHROMIUM ADDITIONS
COATINGS
CORROSION
CORROSION PROTECTION
CORROSION RESISTANCE
FURNACES
GAS TUNGSTEN-ARC WELDING
TARGETS
TESTING
WELDABILITY