| Abstract: | Case studies will be presented in which environmental scanning electron microscopy (ESEM) has been used to provide unique insight into the role of microorganisms in deterioration processes. ESEM is an excellent tool for demonstrating spatial relationships between microorganisms and substrata because hydrated, nonconducting samples can be viewed with a minimum of manipulation. Copper and iron-rich deposits associated with bacteria were detected within corrosion layers on copper and steel surfaces, respectively. Fungal mycelia growing on wooden storage spools were shown to penetrate protective grease on carbon steel wire rope in contact with the spool and to cause localized corrosion. Large numbers of marine bacteria were documented within paint blisters and disbonded regions of fiber-reinforced polymeric composites. In both cases, it appears that microbial gas production resulted in mechanical damage to the substrata. |
