The image in this page shows the microstructure of Aluminum hydroxides formed on the surface of an aluminum alloy component in aqueous environment. The surface underwent the action of sulfate-reducing bacteria, which caused corrosion. The funnel-like structure is caused by the bacteria activity. The image was obtained by means of a PHILIPS ESEM XL 30 TMP W Scanning Electron Microscope. The white line at the bottom right of the image indicates a length of 200 microns.

backscattered electron image coloured by computer aids.

The following image shows the optical appearance of the surface corroded by bacteria with the Aluminum Hydroxide layer.

optical image

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Last updated: March.06.2004

Images are ESEMIR ownership. For any use, ask for permission.