Resistance to aqueous corrosion of steels protected by a Cr-Si diffusion coating
- Ohio State Univ., Columbus, OH (United States)
The simultaneous deposition of Cr and Si to form a diffusion coating on two steels (AISI 1045 and 4140) was studied. In halide-activated cementation packs the use of either a {open_quotes}ternary activator{close_quotes} (e.g., NaF+NaCl+AlF{sub 3}) combined with the elemental metal powders, or else a {open_quotes}dual activator{close_quotes} (e.g., NaF + NaCl) combined with a Cr-Si masteralloy powder, allows for the formation of a surface composition approximating 30Cr-3 to 4Si. Coated coupons were corrosion tested in either 1 N H{sub 2}SO{sub 4} or 3.5 wt % NaCl solution at room temperature. Coupons coated using the Cr-Si masteralloy had superior corrosion resistance in 1 N H{sub 2}SO{sub 4}, while steels coated in packs containing elemental metal powders suffered pitting corrosion. The coated coupons were not adequately resistant to pitting corrosion in 3.5 wt % NaCl solution.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- OSTI ID:
- 140133
- Report Number(s):
- ORNL/FMP--93/1; CONF-9305135--; ON: DE94001091; CNN: Contract FWP-FEAA028
- Country of Publication:
- United States
- Language:
- English
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