Question

a quantity of 0.06g of Cu was deposited from copper sulphate solution by 8A through the solution for 7.6 min. what is the value of faraday constant ?

Answer 1

Answer:

Explanation:

A study has been made of .the influence of benzotriazole as a corrosion,

inhibitor for copper and brass in atmospheric and immersed environments.

The effect of benzotriazole as an addition agent in the copper sulphatesulphuric acid plating bath has been investigated systematically, with a

particular emphasis on the correlation between the structure and properties

of the coatings.

Benzotriazole has been found to be a good inhibitor and v/as discovered to

act as a weak buffer for copper and brass immersed in acidic, neutral and

alkaline solutions. The film^formed by pre-dipping copper into a hot aqueous

solution of benzotriazole^increased the corrosion resistance in many solutions

and v/as particularly beneficial in oxidizing and complexing solutions, as

well a.s in decreasing the rate of oxidation in atmospheric conditions up

to about 350°C. Benzotriazole was found to have similar inhibitive

properties to- napfithotriazole and v/as much better than triazole in several

environments^

It was established, by using the Stereoscan,that the presence of benzotriazole in the plating solution modified the nucleation and growth of the

deposits. With low concentrations adsorption occurred during plating,

while with higher additions it v/as codeposited in a layered structure. Indeposits from the plain bath, the grain size decreased while the hardness

and tensile stress ir±creased;as the bath temperature was lowered and the

current density raised. Deposits from the bath containing benzotriazole

had a much smaller grain size and were much harder, the actual hardness

varying with the plating parameters in a similar manner to that of the

deposits from, the plain bath. The internal stress, measured with the

Spiral Contractometer, could be tensile or compressive and depended upon

the concentration of benzotriazole in the solution and the plating conditions,

2 2 the range of values being from l6k MN/m tensile to 121 MN/m compressive.

The results produced in this work have been analysed in the light of the

known theories and correlations produced