Subscribe for full online access and get...
- Full, instant access to all stories
- Customised email alerts straight to your inbox
- Monthly print magazine
For the best possible experience using our website we recommend you upgrade to a newer version or another browser.
ALWC is characterised by soft orange deposits overlying thin black biofilms under which the steel surface is bright, shiny and pitted. Normally it is found in a narrow band around lowest astronomical tide level. It has baffled corrosion scientists by the seemingly random nature of its attack, with only certain areas of certain piles being affected. These can be holed within 20 years, seriously reducing the life of sheet piled structures. The precise cause of ALWC attack is still unknown.