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Corrosion and Erosion-corrosion of Fe-al Alloys in Aqueous Solutions and Slurries.

Madsen BW
Paper in Wear-corrosion Interactions in Liquid Media TMS PP 49- 78 :49-78
The corrosion and corrosion-erosion behaviors of fe-(5, 10, 15, 20, 25 wt pct) al alloys were investigated in 1n h2so4 solutions. Experiments were conducted in both a conventional electrochemical cell and a slurry wear apparatus developed by the U.S. Bureau of Mines to measure corrosion and erosion-corrosion rates, respectively. Corrosion experiments showed that the addition of aluminum to iron promoted passivation and resulted in lower passivation current densities and peak anodic current densities. When these same alloys were exposed to a moving solution or slurry, the movement of solution reduced the effectiveness of the passivating films and allowed the alloys to corrode at a higher rate for potentials in the passive region than alloys that were only exposed to bubble agitation in the electrolytic cells. Increasing the solution or slurry velocity and adding solids increased the passive current densities of all alloys evaluated. The total wear rates of the fe-al alloys in slurries did not follow a systematic trend, but wore at rates of 2 to 5 times greater than a low-alloy steel or 316 stainless steel.
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OP 217-91
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Paper in Wear-corrosion Interactions in Liquid Media. TMS, PP. 49- 78
Page last reviewed: December 30, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division