However , these treatments use hexavalent chromium chemicals that are extremely toxic .
Note that chromate conversion coatings have been used for over 50 years as treatment to coated or as - fabricated surfaces to boost corrosion resistance and provide a good basis for the subsequent application of paint .
These treatments use hexavalent chromium chemicals that are extremely toxic .
Note that chromate conversion coatings have been used for over 50 years as treatment to coated or as - fabricated surfaces to boost corrosion resistance and provide a good basis for the subsequent application of paint .