Corrosion Susceptibility of AA5083-H116 in Biologically Active Atmospheric Marine Environments
NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
Pagination or Media Count:
Aluminum alloy AA 5083-H116 was exposed to laboratory marine atmospheres with and without fungi. AA5083-HI16 coupons were half covered with potato dextrose agar PDA, a fungal growth media the remaining coupon areas were left bare and fully exposed to the marine atmosphere. Fungal mycelia were inoculated into the PDA and grew over the entire coupon surface during the 90-day exposure. Overlaid with PDA, AA5083-H116 exhibited shallow crystallographic etching and grain boundary attack. Fungi increased the likelihood and severity of pitting corrosion when compared with abiotic controls. Fungal mycelia were associated with trenching and intergranular pits on the bare surfaces. Al-Si-Mg particles were associated with small 10 J..lm pits over the entire coupon surface, regardless of exposure condition.
- Physical Chemistry
- Properties of Metals and Alloys