Old coat wears well

Having been involved in corrosion protection for more than 25 years, I read with interest your article on the protection system developed by the Pacific Northwest National Laboratory.


Having been involved in corrosion protection for more than 25 years, I read with interest your article on the protection system developed by the Pacific Northwest National Laboratory (Production Engineering, 24 April).


It struck me as similar to the thermal spray coating method known as ‘aluminising’, where molten particles of aluminium, or an aluminium or nickel-chromium alloy, or a combination, are applied to a ferrous substrate and heat-treated. This creates a similar multi-layered surface structure, including a pseudo-alloy layer, to that described in the new method.


An established application method such as thermal spraying would be a simpler solution to generate the necessary amount of aluminium at the surface — and such a method is solvent free.


Justin Ruddock
Penfold Metallising Co




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