Electroplating raw material wholesale prompt basic knowledge q&a summary

Electroplating raw material wholesale prompt basic knowledge q&a summary

1. Why does the electrolyte conduct electricity?

A: electrolytes conduct electricity differently from metal conductors.In metal conductors, current is carried by the movement of free electrons. In electrolytes, it is carried by charged ions.In the electrolyte, since the charges of the positive and negative ions are equal, there is no electricity. We call it electrical neutrality.When we apply a voltage to the electrolyte, the ions, attracted by a strong electric field, travel to opposite electrodes.The cation runs to the cathode and the anion to the anode.Their movement allows an electric current to pass through, which is why the electrolyte conducts electricity.

2. In the process of electroplating, is it because the bath temperature is too high that the hanging tool is hot?

A: the heating of the hanger is related to the temperature of the solution, but the main reasons are as follows:

(1) the current passing through the hanger is too large.

(2) the contact on the hanger is poor and the resistance is increased, which makes the hanger hot.

3. What are the main factors controlling the plating thickness?

A: the main factors controlling the plating thickness are current density, current efficiency and plating time.

4. Is the brass plating the same as the bronze plating?

A: no, brass is coated with an alloy of copper and zinc, and bronze is coated with an alloy of copper and tin.

5. What is the relationship between Faraday's law and Faraday's first and second laws?

A: Faraday's law, also known as the law of electrolysis, describes the relationship between the amount of electricity flowing through the electrode and the weight of the electrode reactants.

Faraday's first law: the weight of a metal in electrolysis is proportional to the current and time it takes to pass through the electrolyte.

W = KIt

W -- weight of precipitated material (g)

K -- proportionality constant (electrochemical equivalent)

I -- current intensity (ampere)

T -- electrification time (hours)

Faraday's second law: when the same amount of current passes through different electrolytes, the weight of the precipitated metal is proportional to the chemical equivalent of each electrolyte.

K = CE

C is the proportionality constant.E -- chemical equivalent

6. Why should the plating be washed clean from chemical oil removal to weak acid corrosion?

Answer: because the normal chemical oil removal solution is alkaline, if the oil removal solution is directly brought into the acid corrosion solution, it will have the neutralization reaction between the acid and the base, reducing the concentration and effect of the acid.The product of the neutralization reaction will affect the quality of the coating when it adheres to the workpiece.Therefore, the workpiece in chemical oil removal, must be washed clean by water, to enter the acid corrosion solution.

7. Electroplating appears burr, coarse grain, is usually caused by those reasons, how to solve?

Answer: coating appears burr, coarse grain, basically be plating bath suffers suspension impurity pollution place to cause.The sources are: dust in the air, sludge from the anode, hydrolytic products of metal impurities.In addition, there are bath composition is not normal and operating conditions do not meet the requirements and so on.The solution is to adjust the bath composition and operating conditions.If it is caused by suspended impurities, the bath should be filtered.

8. What is the basic procedure for preparing electroplating solution?

Answer: the basic procedure of preparing electroplating solution is as follows:

(1) put the medicine needed for electroplating with good juice into the material slot (small slot) first, then add the right amount of water to dissolve, pay attention not to pour the medicine directly into the plating tank.

(2) the impurities contained in the solution can be removed by various chemical methods and treated with activated carbon.

(3) the solution that has been treated and placed shall be filtered into a clean plating bath, and water shall be added to the standard amount.

(4) adjust the bath process specification (pH value, temperature, additives, etc.).

(5) finally, low current density is used for electrolytic deposition to remove other metal ion impurities until the solution is suitable for operation.