TIN PLATING - Practice Mode
1) Which is the solution used for cadmium stripping?
2) Which is the name of cadmium plating solution composition for blue passivation?
3) Which solution is used to test for porosity of cadmium and zinc coating?
Explanation:
A 1% volume solution of hydrochloric acid (HCl) is commonly used as a test for the porosity of cadmium and zinc coatings. The test involves applying a drop of the HCl solution to the coating, and observing if the acid causes bubbles to form on the surface. If bubbles form, it indicates that the coating is porous and that the underlying metal is not fully protected from corrosion.
The test can also be used to detect defects in the coating such as pinholes, blisters or scratches.
4) Which is the reason tin cans are used to store the food than Iron?
5) Which electrolyte is used for tin plating?
Explanation:
More than 95% of tin or tin-lead plating is done from acidic electrolytes, while other alloys with copper, zinc, etc are done from alkaline and cyanide electrolytes. For pure tin deposition, sulphuric acid based baths are the most common ones due to its low cost.
Acid sulphate is used as electrolyte for tin plating.