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Steel cathodic protection afforded by zinc, aluminium and zinc/aluminium alloy coatings in the atmosphere

机译：大气中锌，铝和锌/铝合金涂层提供的钢阴极保护

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Zinc has traditionally been the metallic material most widely used to protect steel against atmospheric corrosion due to its ability to afford cathodic protection to steel in all types of natural atmospheres. In recent decades, aluminium and zinc/aluminium alloy coatings have been used instead of zinc in certain atmospheric applications. Although these coatings present some advantages over zinc, they are not able to cathodically protect steel substrates in all types of natural atmospheres. The present paper assesses the cathodic protection afforded by Al (flame spraying), Al/13 Si (hot dipping), 55Al/Zn (hot dipping), Zn/15Al (flame spraying), Zn/5Al (hot dipping), Zn (hot dipping), Zn (discontinuous hot dipping) and Zn (electroplating). Aluminium and aluminium-rich alloy coatings (55%Al/Zn) provide cathodic protection to the steel substrate only in atmospheres that are highly contaminated with chloride ions (>100 mg Cl- m-2 day-1) where these coatings become active. © 2004 Elsevier B.V. All rights reserved.
机译：锌一直以来都是最广泛用于保护钢免受大气腐蚀的金属材料，因为它能够在所有类型的自然大气中为钢提供阴极保护。近几十年来，在某些大气应用中已经使用铝和锌/铝合金涂层代替锌。尽管这些涂层比锌具有一些优势，但它们不能在所有类型的自然气氛中阴极保护钢基材。本文评估了Al（火焰喷涂），Al / 13 Si（热浸），55Al / Zn（热浸），Zn / 15Al（火焰喷涂），Zn / 5Al（热浸），Zn（热浸），Zn（不连续热浸）和Zn（电镀）。富含铝和铝的合金涂层（55％Al / Zn）仅在氯离子高度污染的环境（> 100 mg Cl-m-2 day-1）中具有活性的情况下，才对钢基材提供阴极保护。 ©2004 Elsevier B.V.保留所有权利。

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