How to deal with metal zincate electroplating galvanized blistering

There are many possible causes of blistering in zincate plating, and it is necessary to analyze your process and the entire process to make a general judgment. And what is the so-called blistering of LZ? Is it the peeling one, or the pinhole one?

It also depends on the part you blister, whether it is a forged or machined surface, etc.

Zincate is not only acidic, but also alkaline, hydrogen evolution in alkaline galvanizing is also a normal phenomenon, if the blistering caused by hydrogen evolution depends on your workpiece substrate, some have done heat treatment will have this problem, but also depends on whether you have a hydrogenation removal process, I simply talk about the possibility of blistering, LZ can be checked one by one:

1. The pre-treatment is insufficient, the reason for this is relatively direct, and the workpiece with unclean oil removal is the most likely to blister.

2. Insufficient cylinder opening agent.

3. Caused by impurities, this needs to be dealt with.

4. The current is too large or the brightener is too much, and the coating is brittle.

However, it may also be a problem with the passivation liquid, the information provided by LZ is limited, so it can only be analyzed simply, I hope it will be helpful to LZ, and it is best for LZ to ask its own ** business to provide technical support.

The commonly used galvanizing electroplating solution is weakly acidic, and [H+] is still large compared with [Zn2+] in solution, and there is a co-evolution of hydrogen and zinc on the surface of the plated parts. The formation of hydrogen prevents the tight arrangement of zinc atoms, which affects the electrodeposition rate of zinc, so the coating tends to become fluffy sponge-like. This is the phenomenon of blistering.

Na2Zno2 can be --- with alkaline electroplating solution.

If there are still bubbles, you can consider whether the current is too large? Too high voltage? (more appropriate).

Summary. In response to your question, blistering after plating is due to the following reasons:1

During the electroplating process, the temperature of the zinc alloy surface is too high, which will cause bubbles to appear on the metal surface. 2.There are contaminants on the surface of the zinc alloy, which will affect the surface flatness after electroplating, resulting in blistering.

3.The concentration of the electroplating solution is insufficient, which affects the surface flatness after electroplating, resulting in foaming. In order to solve this problem, it is recommended that you can take the following measures:

1.Control the plating temperature to keep the temperature within the appropriate range to avoid blistering caused by excessive temperature. 2.

Clean the surface of the zinc alloy to ensure that the surface is free of impurities. 3.Check the concentration of the plating solution and keep it within the correct concentration range.

Help: My zinc alloy products often blister after plating, who knows the biggest reason? What should I do? Thank you!

In response to your question, blistering after plating is caused by the following reasons:1During the electroplating process, the temperature of the zinc alloy surface is too high, which will cause bubbles to appear on the metal surface.

2.There is a polluted coarse rock on the surface of the zinc alloy, and the contaminants will affect the surface flatness after electroplating, resulting in blistering. 3.

The concentration of the electroplating solution is insufficient, which affects the surface flatness after electroplating, resulting in foaming. In order to solve this problem, it is recommended that you can take the following measures:1

Control the plating temperature and slag degree to keep the temperature within the appropriate range to avoid blistering caused by excessive temperature. 2.Clean the surface of the zinc alloy to ensure that the surface is free of impurities.

3.Check the concentration of the plating solution and keep it within the correct concentration range.

The biggest reason is poor pre-plating. （1).There is a layer of dense layer of Li rock on the surface of the zinc alloy die casting, which can not be ground off when grinding and polishing, otherwise the porous layer below will be exposed, and the solution will be sucked into the hole, which is difficult to wash, and is wrapped under the bottom layer, which becomes the root cause of blistering after plating; （2）.

Even if it is a dense layer, it is not like rolling metal to cause mountain disturbance and densification, there are always voids, so the degreasing should be thorough, and it is best to use ultrasonic degreasing; （3）.Zinc metal amphoteric metal, can not use strong alkali, can not use strong acid, can only use dilute hydrofluoric acid and sulfuric acid, and the time should be short; (4).Pre-plating should not be done with acidic solutions and strong alkaline solutions, but with weak alkaline or neutral solutions, such as cyanide brass plating solution or neutral nickel plating solution.

Summary. If it is regular, it is a problem of pressure injection, and it is necessary to improve the exhaust of the mold.

Even if there is no blistering in polishing, it can easily blister after water plating.

The so-called zinc alloy refers to the electroplating alloy with zinc as the main metal, and its content should be more than 51% (mass percentage). In addition to this, it contains one or several other metals. For example:

Zinc-nickel alloy (nickel L0%), zinc-iron alloy (divided into high-iron alloy and low-iron alloy, the former has a mass percentage of more than 7%, while the latter is <1%)), zinc-copper alloy (commonly known as cupro, the mass percentage of copper is 15% 25%).

The alloy plating refers to the use of electroplating methods to obtain different zinc alloy plating layers to achieve a certain purpose.

When one or several other small quantities of metal elements are introduced into the zinc coating, its performance is greatly improved compared with that of pure zinc coating. For example, zinc-nickel alloy coating (containing about l0% nickel) has higher corrosion resistance than zinc coating alone.

It is widely used to replace toxic cadmium plating. The introduction of <1% (mass) of iron or diamond metal into the plating may increase its corrosion resistance by more than three times. In addition to this, the zinc alloy coating has excellent thermal stability and low hydrogen embrittlement.

What is the cause of blistering in zinc alloy plating?

Please wait patiently for a few minutes, we are sorting it out, and we will answer you immediately, and please do not end the consultation.

If it is regular, it is a problem of pressure injection, and it is necessary to improve the exhaust of the mold. Even if there is no blistering in polishing, it is easy to blister after water platingThe so-called zinc alloy refers to the electroplating alloy with zinc as the main metal, and its content should be more than 51% (mass percentage). In addition to this, it contains one or several other metals.

For example: zinc-nickel alloy (containing nickel L0%), zinc-iron alloy (divided into high-iron alloy and low-iron alloy, the former has a mass percentage of more than 7%, while the latter is <1%), zinc-copper alloy (commonly known as cupronickel, with a mass percentage of 15% and 25% of copper). The alloy plating refers to the use of electroplating methods to obtain different zinc alloy plating layers to achieve a certain purpose.

When one or several other small quantities of metal elements are introduced into the zinc coating, its performance is greatly improved compared with that of pure zinc coating. For example, zinc-nickel alloy coating (containing about l0% nickel) has higher corrosion resistance than zinc coating alone.

It is widely used to replace toxic cadmium plating. The introduction of <1% (mass) of iron or diamond metal into the plating may increase its corrosion resistance by more than three times. In addition to this, the zinc alloy coating has excellent thermal stability and low hydrogen embrittlement.

If manganese steel and zinc alloy are blistered in electroplating, the general pulse is often caused by improper surface treatment and incorrect electroplating process. Here are some countermeasures for your reference:1

Check the surface treatment: The cause of blistering may be that the surface grease, dust, etc. has not been cleaned, or there are oxides, rust, etc. on the surface that have not been cleaned. Therefore, re-applying the surface treatment to ensure that the surface is clean and flat can effectively reduce the occurrence of plating blistering.

2.Check the plating process: The reason for blistering may be that the plating process is incorrect, such as current density, plating time, electroplating solution temperature and other parameters are not suitable.

Re-adjusting the plating process parameters and adjusting them according to the specific situation can effectively reduce the occurrence of blistering. 3.Talking about the new choice of electroplating solution:

The reason for the blistering may be that the electroplating solution used is not suitable for the plating of manganese steel or zinc alloys, or the quality of the electroplating solution is not good. Choosing the right electroplating solution ensures reliable quality and can effectively reduce the occurrence of plating foaming. 4.

Check the plating equipment: The blistering of the primordial hall may be due to the poor quality or use of the electroplating equipment. Checking the quality of the equipment to ensure that the equipment is in good working order, or replacing the equipment can effectively reduce the occurrence of plating blistering.

In short, for the problem of electroplating foaming, it is necessary to analyze the specific situation and find out the cause for targeted solution.

Hello dear, the biggest reason for good cracking is poor pre-plating. （1).There is a dense layer on the surface of the zinc alloy die casting, which can not be ground off when grinding and polishing, otherwise the cherry clear porous layer below will be exposed, and the solution will be sucked into the hole, which is difficult to wash, and it is wrapped under the bottom layer, which becomes the root of blistering after plating; （2）.

Even if it is a dense layer, it is not as dense as rolled metal, and there are always voids, so the degreasing should be thorough, and it is best to use ultrasonic degreasing; （3）.Zinc metal amphoteric metal, can not use strong alkali, can not use strong acid, can only use dilute hydrofluoric acid and sulfuric acid, and the time should be short; (4).Pre-plating can not use acidic solutions and strong alkaline solutions, and weak alkaline or neutral solutions should be used before spine socks, such as cyanide brass plating solution or neutral nickel plating solution.

Degreasing is not clean, generally zinc alloy will form a layer of oxide film in the air, there is something to remove the oil clean, the oxide film will bubble without treatment, the oxide film goes, the surface is not clean electroplating will also bubble, it is recommended to strengthen the pre-treatment!

The surface treatment before electroplating is the main reason for the blistering of zinc alloy, because zinc alloy is an amphoteric metal, which is easy to react with acid and alkali.

Degreasing is generally alkaline degreasing agent at room temperature, and the pickling solution is generally a mixture of three acids (HCL H2SO4 HNO3).

Degreasing is the main cause of blistering of zinc alloy plating:

Degreasing is generally soaked and stirred for a long time with a heated room temperature degreasing agent, and the chemical reaction time is longer. Generally, the pickling time is short, and it is not easy to produce this foaming phenomenon. (Because the pickling is made with a strong acid, it has strong corrosion, so the general zinc alloy is not oiled during electroplating, and it can be electroplated by activating it with sulfuric acid).

Most of the causes of blistering are related to poor pretreatment:

1。If the degreasing is not exhausted, the weak alkaline degreasing powder should at least turn the surface of the part to gray, indicating that the degreasing is clean.

2。Coarsening: The roughening time should see the uniform bubbles on the surface, and then delay the removal of the part by tens of seconds. In addition, the solution of the coarsening solution should ensure that the concentration is within the normal range, and it is better to analyze and replace the coarsening solution frequently.

3。Copper cyanide: The parts are charged into the slot, and the high current will first impact for tens of seconds and then return to the normal current range, as for the composition of the copper cyanide bath plating solution, you have to keep it normal.

Next time I have a problem, it's good to give a bounty, it took so much time, I typed so many words, there is no return, there is no reason!

You're asking too broad a question.

Zinc alloy electroplating is mainly in the pre-treatment, with concentrated sulfuric acid one-step treatment, also with chemical, electrodegreasing, fluorinate activation, chemical degreasing time can be a little longer, electrodegreasing and activation tens of seconds is enough. When alkali copper is primed, the free cyanide in alkali copper should not be too high, 7-8g l is fine, and cuprous cyanide is about 30-35g l for pre-plating.

Electro-galvanized alloy products are mainly alloy materials containing copper, silicon, aluminum and other components, under the corrosion of acid and alkali, loose ash scale will be produced, affecting the binding force of electroplating, resulting in blistering, peeling phenomenon, degreasing as far as possible to use neutral degreasing agent, electrolytic degreasing using cathode electrolytic degreasing, electrolytic degreasing after activation is particularly important, generally using HF and organic acids (citric acid, benzene sulfonic acid, oxalic acid) the most important need to add corrosion inhibitors such as thiourea or butylenediol, especially after activation, wipe with white paper, There should be no obvious black ash on the white paper, otherwise there will be poor adhesion. This process is mainly related to the essential material of the alloy, so the plating must choose a alloy grade suitable for electroplating. It is best to use ultrasonic water washing after activation, which can clean the dirt adhered to the surface, and then electroplating, of course, the plating is best to use cyanide copper, alkaline copper or neutral nickel.

The pre-treatment is not done well, such as insufficient coarsening.