Publisher: Chemical Society of Nigeria

Scanning and Transmission Electron Microscopy Analysis of A Chromate- Phosphate Conversion Coating.

T. K. Oki, E. Charles, S. Otikor, M. Oki
KEYWORDS: Chromate-phosphate, alloy, X-ray.

ABSTRACT:

Scanning  and  Transmission  electron  microscopy  examination  and  subsequent  analysis  with  attached  EDX have  been  performed  on  a  chromate  phosphate  conversion  coating  on  aluminium-0.2%Fe  alloy.  The initial  lustrous  surface,  comprising  of  grain  features  in  the  alloy  was  replaced  by  cracked  chromate  - phosphate  coating  materials  over  the  treatment  period  employed  in  this  investigation.  The  cracks predominantly  developed  on  relatively  thick  coatings  over  the  alloy  substrate  where  coating  materials  are a  mixture  of  compounds  based  on  chromium,  phosphorous  and  aluminium.  EDX  analysis  revealed  that the coating is basically composed of chromium phosphate. 


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