Question

Is alodine dangerous?

Answer 1

Hint: Alodine is a type of coating that helps metal and parts stay corrosion free, it is not something that should be used as an intake. It is also famously known as chem film, film is used as it is a coating for corrosion resistance.

Complete answer:
The answer to this question is yes, alodine is a dangerous substance. Alodine is one type of coating which helps in corrosion resistance.
Alodine or chem film is a chromate conversion coating that protects metals from corrosion. Chromate conversion coatings are actually a type of chemical conversion coating, in them metal undergoes a chemical reaction at the surface, thus making the metal surface into a protective layer which helps in corrosion resistance.
Moreover, it can also leave a base on the surface finish and it can also protect against loss of electrical conductivity.
Chromate conversion coatings are generally used for everyday items such as screws or hardware. They usually leave a greenish yellow colour to white or gray metals.
Alodine has a complex composition which includes chromium salts, thus it comes under chromium conversion coatings.
If this coating is applied on aluminium, first the aluminium will form aluminium ions, after that the hydroxide ions will react with chromium and aluminium ions to form their respective hydroxides. Under certain conditions, the water will be removed from them and a colloidal sol will be formed which will be deposited on the surface layer as a hydrogel.

Note:
The chromate conversion coating process is highly hazardous and in no circumstances should be used as intake. Some of its side effects are, it can cause skin burns and can even blind a person, inhalation may cause nasal problems, it contains material which causes cancer, etc.