Corrosion of Embedded Ferrous Metals in Woods

Timber is the most widely utilised natural materials in human history. It is a renewable material and readily available. Ferrous metal fasteners and fixtures are often used in the timber structure. They are generally reliable and maintenance free.  However, the pre-mature corrosion failures are identified in the history [1].  Field experience and test even suggested higher corrosion risk for outdoor applications [2]. If not attending carefully, it will lead to serious consequence.  Corrosion scientists also believe that wood provides a corrosive environment through permeable structure acting as an electrolyte sponge.  Recent research is not only focusing on understanding the corrosion mechanisms but also on test methods to evaluate its corrosion behavior. Efforts are made on numeric simulation to quantitatively determine the corrosion performance of the metal embedded in woods.  Various building codes  and technical bulletin have provided the directive and guidance to mitigate such risks.

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