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

Regina, JR

Oak Ridge National Laboratory

关键词: Corrosion;    Aluminium;    Boilers;    Alloys;    Testing;   

DOI  :  10.2172/885600
RP-ID  :  ORNL/SUB/95-SU604/05
RP-ID  :  DE-AC05-00OR22725
RP-ID  :  885600

美国|英语

来源: UNT Digital Library

【 摘 要 】

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.