What is the reason why the surface of the workpiece is blackened by the aluminum cutting fluid

Causes of blackening of aluminum cutting fluid processing workpieces: 1. Burn due to too high temperature 2. Oxidation 3. Corrosion.

It may be that the cutting fluid has been contaminated by other oils in the CNC drilling and milling machine: for example, the guide oil or the cutting fluid used now has deteriorated and rotted; Replace the cutting fluid, and wash the liquid supply line of the machine several times.

Idawell cutting fluids are of excellent quality and have a strong anti-rust ability that lasts for 50 days.

The blackening of the aluminum parts is corroded, and the cutting fluid cannot be used on the CNC I have a special CNC contact 9081374

The cutting fluid used reacts with the aluminium part.

Please choose a good cutting fluid.

If the choice of cutting fluid should correspond to your metalworking products.

In Guangdong Machinery Research Institute, there are various different types of products that can be correspondingly selected.

Different machining lubrication workpieces should choose different cutting lubrication.

We can provide full technical support.

If needed.

It may be that aluminum corrosion is divided into chemical corrosion and electrochemical corrosion, aluminum in weak acid (less than or strong alkali (greater than inside will be corroded. Prevent chemical corrosion: the cutting fluid itself is alkaline, preferably the pH value of the cutting fluid is less, and aluminum corrosion inhibitors are added.

There are also alkaline additives in the cutting fluid that will also produce yellow spots after the surface of the aluminum workpiece is air-dried, which is also corrosion. Electrochemical corrosion: The processed products should not be placed on iron plates or iron products, and with cutting fluid, which is easy to produce electrochemical corrosion.

Here are some ways to deal with the oxidation of cutting fluid on aluminum surfaces: such as Bridge 1Wash with alkaline stain remover:

Using some special alkaline detergents, the oxide layer on the surface of aluminum can be effectively removed. 2.Mechanical polishing:

The oxide layer can be removed by mechanically polishing the aluminum surface. 3.Chemical Treatment:

The oxide layer of the cutting fluid is treated with chemicals such as acids or alkalis, which can be dissolved or converted into other substances. 4.Prevent oxidation of cutting fluids

By controlling the pH value, temperature and other parameters of the cutting fluid, the oxidation of the cutting fluid is avoided, thereby reducing the formation of the oxide layer. 5.Use antioxidants:

Treating the surface of aluminum with some antioxidants can reduce the rate of oxide formation, thereby reducing the problem of oxidation of cutting fluids. The above are some methods to deal with the oxidation of cutting fluid on the surface of aluminum, which should be selected according to the actual situation.

Dear, it is a pleasure for you The treatment of cutting fluid oxidation on aluminum surface is as follows:1Use an acidic cleaning solution:

Diluted organic acids such as nitric acid or hydrochloric acid can be used to clean the aluminium surface. This method quickly eliminates the oxide layer on the aluminum surface and reduces the cutting fluid contamination caused by the oxide layer. 2.

Mechanical polishing: The oxide layer on the surface of aluminum can be easily removed by mechanical polishing, thereby mitigating its fouling effect on the cutting fluid. Polishing can be done using a special abrasive cloth or a grinder.

Shed which 3Use special cutting fluid for aluminum alloy: If you need to process aluminum products in the same row, it is recommended to use special cutting fluid for aluminum alloy.

This cutting fluid has the function of anti-corrosion and anti-oxidation, and will not cause oxidation on the aluminum surface during machining. 4.Upgrading processing equipment:

It is also possible to reduce the contamination of the cutting fluid by upgrading the processing equipment and replacing the process parameters, thereby reducing the possibility of oxide formation. When it is found that the cutting fluid is oxidized on the aluminum surface after cutting, corresponding measures should be considered in time. However, it should be noted that when using organic acids for cleaning or mechanical polishing operations, relevant operating procedures and safety operation standards must be strictly adhered to to avoid damage to individuals and the environment.

Thank you for your patience, I hope mine is helpful to you, if you are satisfied, please give me a thumbs up and wish you a happy life.

Colleagues often complain that a batch of aluminum alloy products made by our company will oxidize and blacken (small area) after a few days after vibration grinding. The particles are very small, it is not easy to judge before processing, after hard anodizing, the surface color is inconsistent, and the defects are very high every summer, and the customer can not accept it, so I really don't know how to deal with it.

As we all know, the surface layer of aluminum will form a dense alumina protective film when it comes into contact with air, which can protect the aluminum inside from oxidation. However, if the surface of the aluminum product needs to be hard anodized, this dense alumina protective film will cause the local coloration of the final product surface to be inconsistent. To solve this problem, we must first start from the processing technology of aluminum products: whether the raw material itself is consistent, whether the constant temperature static and homogenization effect ensure the uniformity of the processing surface of the aluminum substrate when the aluminum ingot is smelted, this aspect can only be solved from the parameter control of the aluminum ingot smelter, which is also the most difficult, so if you want to find a breakthrough from the material to improve this problem, the effect is very small.

In terms of processing technology, the processing of aluminum alloy products generally goes through the following steps: aluminum sawing material, CNC finishing turning, CNC finishing turning, deburring, grinding machine rough grinding, grinding machine fine grinding, hard anodizing, inspection, packaging, etc., of course, the products are different, and the processing steps will be different. Process analysis:

Machinery and equipment, people, methods, and auxiliary materials (cutting fluids, lubricating oils) in processing, from the bad characteristics of the product, it is understood that the proportion of oxidized products is not very high (about); The part where the oxidation occurs is not very fixed and irregular; The processing methods, equipment, and personnel have not changed. So what's the problem? There are three possible reasons:

First, the auxiliary materials (cutting fluid, lubricating oil) in the processing have not been replaced for a long time, deteriorated, and the surface of the product has not been cleaned in time after processing; Second, during the processing process, the cutting fluid is unevenly distributed on the surface of the product, and the local heating temperature on the surface of the product is too high; Third, hard oxidation. In view of these three reasons: first, it is necessary to start from the maintenance of the machine, regularly replace the cutting fluid (generally once a month in summer, once a month in winter), and clean up the residue in the machine by a special person (a small cleaning every day, a comprehensive cleaning once a week, including all channels); Second, adjust the outlet of CNC cutting fluid and grinding fluid of grinding machine, generally using a flat structure instead of a circular structure, and the position is directly above the product processing, which needs to be determined by considering the processing part; Increase the amount of liquid outflow, reduce the surface temperature of the processed product, especially the local unevenness; Third, adjust the contact area between the hanger and the workpiece; Extend the cleaning time of the surface of the workpiece, reduce the depth of the surface of the blank during processing, and the natural oxide layer is not cleaned; The surface temperature of the workpiece is controlled during oxidation, and the heat is unevenly taken away by heating.

The above, don't try it, there are better suggestions, please provide reference.

Due to the strong chemical activity of aluminum, acidic or alkaline solutions will corrode aluminum, and cutting fluids are generally alkaline.

However, in order to solve the problem of aluminum corrosion, aluminum corrosion inhibitors are usually added to the cutting fluid.

Because there is sodium nitrite in it, I have to use oil-melted microemulsions, and I have a buckle 9081374

Aluminum alloy is a very sensitive amphoteric metal material, and acid and alkali can react, and it also contains some trace impurities will also react, in addition, if the cutting fluid used in processing contains free chloride ions will also react, these reactions will directly lead to the discoloration of aluminum alloy material, and will also break the internal stability of the cutting fluid used to appear rotten and odorous.

If the use of special aluminum alloy cutting fluid still appears to process the phenomenon of blackening, that is, there is a mistake in the maintenance of the cutting fluid in the process of use, as the so-called, three points rely on quality and seven points depend on maintenance, we should pay attention to regularly detect the pH value, concentration, whether it contains impurities, etc., and regularly add the stock solution to ensure that the concentration of aluminum alloy cutting fluid is maintained in a suitable state.

Aluminium alloy is a particularly sensitive amphoteric metal, which will oxidize and change color after being exposed to the air for a long time. If the cutting fluid used in the machining process contains sulfur, chloride ions and nitrates, it will quickly cause discoloration of aluminum parts.

Therefore, when purchasing cutting fluid, you should specifically declare to the supplier that it is used for processing aluminum parts, and at the same time require the supplier to provide samples for trial to avoid unnecessary losses.

However, it is best to cooperate with a reputable manufacturer, and they will have a free sample to try. At the same time, there will also be a mature aluminum alloy special product DC-504A.

Bad cutting fluid will corrode the work, and you must choose the cutting fluid for aluminum when processing aluminum parts

Different cutting fluids, the machining quality of aluminum parts will affect the overall color difference corrosion. Ningbo Jiasibao (Taiwan-funded) emulsified cutting fluid conforms, copper parts, aluminum parts, complex processing. No corrosion, no mildew, no discoloration, no odor. Information 13586584871 Master Gu.