What is Nickel Plating? The cause of white spots in electroplating nickel

The method of plating a layer of nickel on a metal or some non-metal by electrolysis or chemical methods is called nickel plating.

Nickel plating is divided into electroplating nickel plating and electroless nickel plating. Nickel plating is an electrolyte composed of nickel salts, main salts, conductive salts, pH buffers, and wetting agents.

Nickel metal for the anode and nickel for the cathode are plated with direct current.

A homogeneous, dense nickel coating is deposited on the cathode plate. Bright nickel is obtained from plating solutions with brightener, while dark nickel is obtained from electrolytes without brighteners. Electroless nickel plating is done with the addition of metal salts and reducing agents.

A method of obtaining a nickel plating layer on the surface of a material by an autocatalytic reaction. The white spots that appear in nickel plating are caused by a high carbon substance, which is produced during the carburizing process of heat treatment and the pickling process during pre-plating treatment. (1) The carbon (mainly Fe, C) of the surface layer of 1018 material after normal carburizing can reach The particles protruding in the coating are due to the incomplete cleaning of the pretreatment, so that the particles on the surface of the workpiece fall into the plating solution, and in the electroplating process, due to the stirring effect, these particles free in the plating solution are co-deposited with nickel ions.

2) The holes that are not covered in the coating are mainly caused by overcorrosion (surface decarburization) during the pretreatment pickling process. The main component of the pickling solution in the electroplating plant is HCl 1:1 H2SO4 (98%)50 ml L This formula can be used for ordinary carbon steel and high carbon steel.

the concentration is too high. The higher the carbon content, the more intense the pickling reaction. Conductivity of the surface after decarburization to the workpiece.

and the adhesion of the plating has a great impact. The holes in the plating are actually caused by the poor conductivity (or poor adhesion) of the high-carbon part, which is difficult to cover the coating.

The white spots that appear in nickel plating are caused by a high carbon substance, which is produced during the carburizing process of heat treatment and the pickling process during pre-plating treatment.

Solution: Improve the pre-treatment cleaning process and use ultrasonic cleaning.

The method makes the particles with poor adhesion fall off in the cleaning after carburizing, and filter the plating solution in time. The main improvement of the pickling process is to reduce the concentration of the pickling solution and add a suitable corrosion inhibitor.

And properly control the pickling time to avoid over-corrosion.

By taking the above measures, the product is electroplated with white spots.

The problem was solved by the nature of the root good Minzi.

Characteristics, properties and uses of electroplating nickel:

The electroplated nickel layer has a high stability in air, and due to the strong passivation ability of the metal nickel, it can be on the surface.

Rapidly generates a very thin passivation film that resists atmospheric, alkali and certain acids.

Electroplated nickel crystals are extremely fine and have excellent polishing properties. The polished nickel coating gives a mirror-like luster appearance while maintaining its luster in the atmosphere for a long time. Therefore, electroplating is often used for decoration.

The hardness of nickel plating is relatively high, which can improve the wear resistance of the surface of the product, and the nickel plating layer is commonly used in the printing industry to improve the hardness of the lead surface. Due to the high chemical stability of nickel metal, some chemical equipment also commonly uses a thicker nickel plating layer to prevent you from being corroded by the medium.

The reason why electroplating nickel baths turn black is due to peroxidation. The main possible reasons are as follows: 1

Nickel solution contains a large amount of dust, oil and other impurities, in the electroplating process, with the formation of oxygen on the surface of the plate, the impurities will react to form oxides, and the oxides are easy to blacken. 2.The current density is too high, and if the standard requirements of the electroplating process are exceeded, the plating coating is prone to blackening.

3.If the temperature is too low, the temperature will also make the electroplating coating black, and the general electroplating temperature is between 30 and 45 degrees. 4.

The pH value of the nickel solution is not enough, and under normal circumstances, the pH value of the nickel plating agent is in between. If it is not in this range, it will blacken the coating. 5.

If the nickel solution is not changed regularly, the electroplating coating is easy to blacken.

Dear, the reason for the appearance of yellow spots in electroplating neutral nickel may be that there are too many impurities in the electroplating solution or improper electroplating process, resulting in an uneven electroplating layer. If you want to make the neutral nickel plating whiter and brighter, you can consider adding some brighteners, such as magnesium sulfate, zinc sulfate, etc. At the same time, the electroplating process can also be optimized, such as adjusting the temperature, current density, pH value, etc. of the electroplating solution to achieve better electroplating results.

Summary. Hello, happy to answer your questions and have found the answer for you, section.

1. Electroplating neutral nickel always has macular black spots, which are generally caused by excessive current, unreasonable temperature, and unbalanced electrolyte.

2. In order to make the electroplating neutral nickel whiter, in addition to controlling the current, temperature, and electrolyte, you can also add a substance called "nickel white".

3. This is a special color remover, specially used for neutral nickel plating, which can effectively eliminate the yellow spots and black spots on the surface of electroplating neutral nickel, and make the plating layer whiter.

Plating neutral nickel always has yellow spots and black spots, and electroplating neutral nickel needs to be whiter, and what needs to be added.

Hello, happy to answer your questions and have found the answer for you, section.

1. The yellow spot black spot in the electrolytic orange dipping neutral nickel is generally caused by excessive current, unreasonable temperature, and unbalanced electrolyte.

2. In order to make the electroplating neutral nickel whiter, in addition to controlling the current, temperature, and early electrolyte, you can also add a substance called "nickel white".

3. This is a special color remover, which is specially used for neutral nickel plating with round ridges, which can effectively eliminate the yellow spots and black spots on the surface of electroplating neutral nickel and make the plating layer whiter.

Electrically neutral nickel phWhat is the temperature, Baumé, and voltage? That nickel-white substance** has.

The temperature of electrically neutral nickel is generally 550, the Baumé dispatch degree is, and the voltage is. That kind of nickel-white substance can be bought in metal markets, metallurgical factories, hardware stores, etc.

You're talking about hanging plating or barrel plating, I'm talking about barrel plating, and nickel white is metal or liquid.

I'm also talking about barrel plating, nickel white Qi manuscript coarse is a metal coating, is a coating composed of nickel and polyurethane, often used for powder coating on metal surface, can also be used for metal surface spraying coating Gaozhen, Jingwei has excellent corrosion resistance, high temperature resistance, wear resistance and other characteristics.

Is there any liquid raw material that can solve the problem?

Our customer asked for a whiter nickel layer.

If there are macular black spots in electroplating neutral nickel, you can consider adding lead-containing reducing agent and copper-containing reducing agent to the electroplating solution to play a role in cleaning and whiteness. The lead-containing reducing agent can reduce the lead deposits in the electroplating solution and avoid the appearance of yellow spots after the plating of the lead. Copper-containing reducing agents can inhibit the cavitation of oxon surfaces and reduce the appearance of black spots in copper deposits after electroplating. The corresponding liquid reducing agents include:

lead reducing agents, such as lead glycolate, lead chloride, lead phosphate; Copper reducing agents, such as copper acetate, copper nitrate, copper chloride, copper cyanamide, and other reducing agents containing copper.

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What is the pH of neutral nickel?

The pH of neutral nickel is in between, which is a relatively stable value and is the value that is commonly used for measurement. Its solution should be acidic, but the pH is average, and it is not too acidic or alkaline. Fighting luck.