The Effect of Bacteria on Corrosion Fatigue in AA7075

The Effect of Bacteria on Corrosion Fatigue in AA7075

Sarah E. Galyon Dorman

SAFE, Inc

3290 Hamal Circle

Monument, CO 80132

United States

Sarah E. Collins

CAStLE-United States Air Force Academy

2354 Fairchild Dr, Suite 2J2

USAF Academy, CO 80840

United States

Benjamin K. Hoff

CAStLE-United States Air Force Academy

2354 Fairchild Dr, Suite 2J2

USAF Academy, CO 80840

United States

Daniel H. Henning

CAStLE-United States Air Force Academy

2354 Fairchild Dr, Suite 2J2

USAF Academy, CO 80840

United States

Alexander J. Hooks

CAStLE-United States Air Force Academy

2354 Fairchild Dr, Suite 2J2

USAF Academy, CO 80840

United States

Johannes Weinberg

CAStLE-United States Air Force Academy

2354 Fairchild Dr, Suite 2J2

USAF Academy, CO 80840

United States

ABSTRACT

As more industries and nations focus on environmental protection, the desire to develop non-toxic, sustainable coatings to protect against corrosion becomes a primary focus. One of the areas on the cutting edge of new coating development is the use of bacteria in corrosion prevention coatings. For many years the focus in the corrosion community was on microbial influenced corrosion with the assumption that all bacteria had negative consequences for corrosion and corrosion fatigue. More recently it has been documented that a variety of bacteria can protect against general surface corrosion. None of the work to date on bacteria preventing general corrosion has shown that the inhibitive effects could also be applied to corrosion fatigue. Researchers at the United States Air Force Academy discovered that a bacteria, Ralstonia pickettii, is capable of reducing the fatigue crack growth rate of AA7075-T651 and AA7475-T7351 in 0.06M NaCl to near that of chromate.

Key words: Corrosion fatigue, corrosion fatigue inhibition, Ralstonia pickettii, microbial induced corrosion, environmentally assisted cracking

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