Effect of acid immersion on RTV silicone rubber coatings in inclined plane tests

Author

Jahromi, All Naderian ; El-Hag, Ayman H. ; Jayaram, Shesha H. ; Cherney, Edward A. ; Sanaye-Pasand, Majid ; Mohseni, Hosein

Author_Institution

Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada

fYear

2005

fDate

16-19 Oct. 2005

Firstpage

313

Lastpage

316

Abstract

The paper presents the results of an investigation into the effect of acid immersion on the aging of room temperature vulcanized (RTV) silicone rubber coatings in inclined plane tests (IPT). Two commercial coatings, RTV-A filled with ATH (aluminum tri-hydrate) and RTV-B filled with silica, are compared before and after acid immersion. Acid aging consists of immersing the samples in 3.9 pH nitric acid at a temperature of 90°C for 2 weeks. The relative comparison between the two samples is based on the development of the fundamental and third harmonic of the leakage current during IPT tests, eroded area, the time to failure and SEM microphotographs. All of these observations show that acid rain damages RTV-A more severely than RTV-B. However virgin ATH filled sample showed a better performance compared to the silica filled material.

Keywords

ageing; air pollution; environmental degradation; filled polymers; insulation testing; leakage currents; microphotography; scanning electron microscopy; silicone rubber; vulcanisation; 2 weeks; 90 C; SEM microphotographs; acid aging; acid immersion; aluminum tri-hydrate; commercial coatings; inclined plane tests; leakage current; pH nitric acid; room temperature vulcanized silicone rubber coatings; silica filled material; Aging; Coatings; Insulation life; Insulator testing; Leakage current; Polymers; Rain; Rubber; Silicon compounds; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 2005. CEIDP '05. 2005 Annual Report Conference on

Print_ISBN

0-7803-9257-4

Type

conf

DOI

10.1109/CEIDP.2005.1560684

Filename

1560684