Estimating the gas permeability of commercial volatile corrosion inhibitors at elevated temperatures with thermo-gravimetry

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• 作者：Niel Pieterse ; Walter W. Focke ; Eino Vuorinen and Ilona Rá ; cz
• 关键词：B. Weight loss ; C. Corrosion inhibitor ; C. Atmospheric corrosion
• 刊名：Corrosion Science
• 出版年：2006
• 出版时间：August 2006
• 年：2006
• 卷：48
• 期：8
• 页码：1986-1995
• 全文大小：144 K

文摘

Volatile corrosion inhibitors (VCIs) are incorporated into packaging paper or film to protect metals against atmospheric corrosion. The vapour pressure determines the equilibrium concentration of a volatile corrosion inhibitor (VCI) in the surrounding atmosphere. However, the rate at which the VCI can be delivered across the air gap to a metal surface is determined by the gas permeability. This is the product of the vapour pressure and the diffusion coefficient: S_A = P_AD_AB. The gas permeability of commercial VCIs was estimated at elevated temperatures from vaporisation rates measured using a simple thermo-gravimetric method (TG).