Smart coating hits rust where it hurts

 作者:侯氢     |      日期:2019-02-28 10:16:06
By Paul Marks PLANES, trains and automobiles could one day last a whole lot longer thanks to a smart coating that stops rust in its tracks. The material reacts to damage by releasing a substance that blocks corrosion then reseals the breach. Today, metals are protected from rusting either by galvanising them with a thin layer of zinc, or by applying a waterproof polymer film. But these only stop corrosion if their surface remains pristine. The moment it is punctured,