Metals & Chemicals

Chromate conversion is a type of conversion coating that is applied to passivate aluminium, zinc, copper, silver, cadmium, magnesium, tin and their alloys to slow down corrosion. This process use different deadly chromium compounds which may consist of hexavalent chromium. Now the industry is developing less toxic alternative so as to comply with substance restriction legislation. One choice is trivalent chromate conversion that is not as effective but it is less environmentally damaging. It is also usually used on aluminium alloy parts in aircraft industry where it is frequently called chemical film. This has an added value as a primer for following organic coatings, as raw metal, particularly aluminium, is so difficult to paint or glue. The chromated parts keep their electrical conductivity to changeable degrees, depending upon the coating thickness. This process can be used to add color for enhancing or identification purpose. Chromate coatings are very soft and gelatinous when ...

Anodizing metals is an electrolytic process inorder to produce controlled aluminum oxide films on aluminum. Oxide will form naturally on an untreated aluminum, but the process of anodizing produces a coating that is uniform, much harder, and more dense than natural oxidation. Aluminium oxide will also possess superb thermal and electrical insulating qualities also. This anodic film is produced by converting the exterior of the part into aluminum oxide. Not like paint, which will flake off if not applied correctly, anodized aluminum finishes are in fact formed from the original stuff and cannot peel off. The aluminum oxide finish is so hard and exceptionally will wear anodizing resistant. Anodizing coating on Houston is best for many consumer products and various sporting goods due to its aesthetic and corrosion protection property. It is the primary finish for aluminum aircraft parts together with major components before congregation and painting. Parts can be dyed during the proce...