How to remove copper green How to remove copper green from copper surface? Thanks!

1. Vinegar bubble method. Wash the rusty copper, placed in a small dish, pour a little cooking vinegar until submerged. Over 24 hours after taking out, with a small brush to brush off the residual rust, and then wash the vinegar solution with water, wipe clean and dry can be, during which you can check, if it has been almost do not have to dip, so as not to damage the copper.2. Boiling water immersion method. Rusted copper is sometimes covered with a layer of soil rust that can not be washed off, then you can first put the rusted copper into a bowl, and then poured into the temperature of 80 ℃ to 90 ℃ of boiling water until it is submerged. 5 minutes after it will be taken out, with a small brush to brush clear, dry can be. Encounter soil rust serious, but also the water can be heated to boiling, so that the soil rust off.3. dry brush method. When the patina or rust attachment is relatively shallow, should try to avoid using chemical means such as vinegar soak, but can be changed to dry brush method. Specific method is a large brown brush pen, the brown hair on the brush head cut to 0.5-0.7 centimeters from the root can be used. First of all to be brushed rusty copper placed on a glass plate, fixed, holding the root of the oil brush evenly brush, pay attention to the force, otherwise the effect is not good, and then wash with water.4. Heating method. This method is mainly for rust shallow iron money. The main component of rust is ferrous oxide, its molecular structure is relatively loose, so the use of heat expansion and contraction principle can make part of the rust of iron money off. But the use of this method, must pay attention to add a receiving vessel (such as pots and other metal containers), in addition it is best to add some water. Secondly, the heating time should not be too long, generally high-fire heating for three or four minutes, removed with a cold wet towel to cover, rust will naturally fall off. Choose the heating method of rust, the object should be iron is still good and corrosion is relatively shallow iron money, can not be serious corrosion and copper body has been very fragile copper with the heating method of rust, otherwise this has been very fragile copper will not be able to withstand high temperatures and fragmentation, broken bones. 5. also heard others say knife scraping method. The use of this method should pay attention to the right degree of lightness, if not careful, light will be scraped all over the copper, heavy the entire copper body damage. I don't really recommend this, but if you have a good grasp of it, you can try.

How to get rid of the patina on the top of the bronze

The method of removing the patina

1, China's bronze archaeological restoration methods: we are here a few thousand years ago, samsung heap unearthed things can be so the whole, the advantage: absolutely no harm to the bronze. With one hundred and sixty grams of fine wood shavings sixty grams of talcum powder two hundred and forty grams of wheat bran and poured into the fifty grams of vinegar mixed into a paste like coated in the rusty bronze wind drying after the patina off 2, grinding method: grinding with toothpaste, because toothpaste contains a large number of abrasive silica, can be the surface of the oxidized layer of the copper machine grinding off. 3, soot method: brine point tofu, a thing of the world, for the oxidized layer of the surface of the copper machine, you can use soot to rub vigorously, and the oxidized layer of the copper machine. Can use soot rubbing vigorously, you can achieve very good results. 4, eraser method: as the name suggests, is to rub vigorously with an eraser. The latter three methods to copper oxide layer will be more or less damage to the surface of the copper machine a few microns.

Copper green how to remove convenient and simple

. Vinegar bubble method.

Wash the rusty copper, put it in a small dish, pour a little edible vinegar until submerged. After 24 hours, take out, use a small brush to brush away the residual rust, and then wash the vinegar solution with water, wipe clean and dry.

2. Boiling water immersion method. Rusty copper is sometimes covered with a layer of rust that can't be washed away, then you can first put the rusty copper into a bowl, and then pour into the boiling water at a temperature of 80 ℃ to 90 ℃, until it is submerged.

5 minutes after it will be removed, with a small brush to brush clear, dry can be. Encounter soil rust is serious, you can also heat the water to boiling, so that the soil rust off.

3. Dry brush method. In the case of patina or rust attachment is relatively shallow, should try to avoid using chemical means such as vinegar bubbles, and can be changed to dry brush method.

The specific method is to choose a large oil brush, the brown hair on the brush cut to 0.5-0.7 cm from the root can be used. First of all, to be brushed rusty copper placed on a glass plate, fixed, hold the oil brush root evenly brush, pay attention to the force, otherwise the effect is not good, and then wash with water.

How to remove patina

Hello, these are the ways to get rid of patina:

The most effective way is to use 160 grams of fine wood shavings, 60 grams of talc, 240 grams of wheat bran, and then add 50 milliliters of vinegar, mixing into a paste, coated in the rusty copper, air-drying, the patina naturally comes off.

Abrasive blasting cleaning

Abrasive blasting is a dry or suspended in liquid abrasive directed 'spray to the surface of metal parts or products to remove the corrosion products of physical cleaning methods. Abrasive blasting cleaning removes rust oxidation, dry dirt, grit or paint from metal surfaces.

Abrasives used for dry sandblasting include metal grit, iron shot, fine sand, glass, and others. In the selection of specific abrasives should be considered when the abrasive hardness, density, particle size and shape and other factors.

The equipment used in the sandblasting process are: sand blasting blades or impellers that do not use air, pressure nozzles set rubidium: suction nozzle equipment, etc. See the second introduction. Sandblasting cleaning is the removal of steel and non-ferrous metal surface oxide skin and other corrosion products of the common method of cutting

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How to remove the patina

On the use of home vinegar sold in the market acid, with a small soft brush slowly brush, wash the time to be careful, be careful with your hands Do not hurt themselves.

(1) can take a small grain of oxalic acid on the rust stains, a few drops of warm water, gently rub, and then wash with water. Note that the operation should be fast to avoid corrosion.

(2) such as fresh lemons, can be squeezed out of its juice drops in the rust stains on the rubbing, repeated several times until the rust stains removed, and then washed with soap and water. (3) 10% acetic acid wipe rust stains, or stained part of the soaked in acetic acid, and then rinse with water the next day.

(4) with 10% lemon solution or 10% oxalic acid solution to wet the rust stains, and then soaked in concentrated salt water, the next day wash and rinse. (5.) Just soak in rice water that has been sitting for a few days for a few hours and then wash! After removing the rust, always remember to apply a thin layer of oil, or petroleum jelly on its surface.

This will maintain the results of rust removal.

How to remove patina?

The cleaning to remove corrosion products from the metal surface is called descaling cleaning usually used methods are physical (including manual and Gong Gong grinding methods) and chemical (including acid washing, alkaline washing, salt bath and ultrasonic method), and electrochemical methods (electro-oblique descaling).

First, abrasive blasting cleaning abrasive blasting is the dry or suspended in liquid abrasive directed 'spray to the surface of metal parts or products to remove corrosion products of physical cleaning methods. Abrasive blasting cleaning can remove the metal surface of the rust layer of oxidized skin, dry dirt, sand or paint.

Abrasives used for dry sandblasting include metal grit, iron shot, fine sand, glass, and more. In the selection of specific abrasives should be considered when the abrasive hardness, density, particle size and shape and other factors.

The equipment used in the sandblasting process are: sand blasting blades or impellers that do not use air, pressure nozzles set rubidium: suction nozzle equipment, etc. See the second introduction. Sandblasting cleaning is the removal of iron and steel and non-ferrous metal surfaces such as oxidized skin corrosion products commonly used method of adjudication Second, acid etching rust Acid etching is through impregnation in an acid-water solution to remove the metal surface oxidized skin and other impurities 's chemical cleaning methods.

Due to the acid, etching is more economical and suitable for continuous operation, so it is the most effective way to remove the oxidized skin on the metal surface of large tonnage products. Especially cleaning of steel products, such as billets, ingots, steel plates, and steel strip, wire, tubes and so on.

Can also be used for steel forgings; castings cleaning rust. 1. Acid etching solution Acid etching solution is commonly used in the acid is sulfuric acid and hydrochloric acid.

The advantage of sulfuric acid is low cost, less smoke, less dosage, usually 5% to 10% concentration of sulfuric acid at 60 ~ 80 ℃ temperature for acid etching, the disadvantage is the generation of Fe2 (SO4) 3 water solubility is small, easy to produce hydrogen embrittlement. In order to prevent hydrogen embrittlement can be added to the sulfuric acid bath about 5% of nitric acid or dichromate.

Hydrochloric acid is also often used in acid etching acid, usually used in concentrations of 5% to 15% of the hydrochloric acid reaction at room temperature, when the temperature exceeds 40 ℃ there will be hydrogen chloride gas evaporation caused by the loss of acid and harmful to the human body. The advantage of hydrochloric acid is that the salt generated by the acid corrosion of water solubility is good, fast rust, metal hydrogen embrittlement of the harm is small.

Acid corrosion using acid and phosphoric acid, but the price is higher, less used. In order to inhibit the corrosion of the acid on the metal matrix to be added to the corrosion inhibitor or hydrogen embrittlement inhibitor to reduce hydrogen embrittlement, prevent the occurrence of pitting, reduce acid consumption.

But they have no significant impact on the removal rate of corrosion products. 2. The structure of the acid-etching tank The materials that make up the acid-etching tank are wood, concrete, brick, plastic and steel plate.

Acid-resistant lining material on the tank shell to play a protective role, the lining material is usually composed of natural rubber, pure rubber or synthetic rubber. Acid-resistant bricks are used for lining the four walls and bottom of the tank.

Figure 22-9 is a production capacity of 3.6 ~ 4.5r for the coil of steel strip rust treatment of the structure of the acid-etching tank schematic. Figure 22-9 Acid etching tank structure a. Acid etching tank structural materials; b. Acid washing tank cross-section III. Salt bath method to clean up oxidized skin The principle of salt bath method to deal with oxidized skin has been introduced in the second.

When the chemical reaction of the oxides in the oxide skin on the metal surface, due to the different expansion coefficients of the oxide layer and the metal substrate will make the rust scale and the metal substrate separation and shedding. Salt bath method to remove the oxide skin can be divided into oxidation, electrolysis and reduction method.

1. Oxidizing molten salt treatment method This method has a wide range of uses, the operation is simple, so a large number of industrially produced products such as stainless steel, titanium metal round material, bar, wire and strip are used in this way. This salt bath operating temperature range of 205 ~ 480 ℃, such as stainless steel surface rust scale containing 73?, 18% Cr, 9% Ni oxides in the sodium hydroxide and sodium nitrate salt bath occurs in the following oxidation reaction: 2Fe3O4 + NaNO3 = 3Fe2O3 + NaNO2 2FeO + NaNO3 = Fe2O3 + NaNO2 Cr2O3 + 3NaNO3 = 2CrO3+3NaNO2 CrO3+2NaOH=Na2CrO4+H2O [page] Under the action of the manganese dioxide catalyst, sodium nitrite reacts with the oxygen in the air and then transforms into sodium nitrate.

Generated FezO,: oxidized skin, etc. easily removed by acid etching dissolution. Due to the pretreatment effect of molten salt so that the concentration and temperature of the etching solution are greatly reduced.

And to completely remove the oxide skin, in the salt bath treatment should be followed by pickling or acid etching treatment. 2. Reduction method Reduction method is the method of removing the oxide skin with sodium hydride, also in the molten alkali bath.

In the sodium hydroxide bath in the metal sodium and hydrogen reaction to generate sodium hydride and immersed in the molten alkali bath in contact with the metal of the oxide skin Shen iron, bowl, nickel, chromium oxides reduced to metal, when the metal from the molten alkali out of the cooling, due to the rust and scale and the metal substrate between the difference between the coefficient of expansion and the residual oxide skin from the metal surface off. The process of reduction method is as follows: sodium hydride generation a reduction of oxide skin a water cooling a pickling a water washing.

Molten sodium hydroxide bath temperature is maintained at 370 ~ 400 ℃, which contains 1.5% ~ 2.0% NaOH wide reaction formula: 2Na + H2 = 2NaH 4NaH + Fe304 = 3Fe + 4NaOH The device is shown in Figure 22-10. Figure 22-10 sodium hydroxide method of rust removal device 3. Electrolysis method in neither chemical oxidation nor chemical reduction of molten salt in the direct current, the molten salt is activated and has oxidizing or reducing properties.

Electrolysis molten salt method equipment is very simple, by a DC power supply, a reversing switch, a positive pole, a furnace wall or workpiece for the negative pole and a conductive medium (molten salt) composition. Molten salt electrolysis is mainly used to remove sand from castings.

Electrolysis time is determined according to practice, generally between 15 ~ 30min. Fourth, alkaline descaling The use of alkaline media, metal ion chelating agent to metal oxides in the metal ion integration and rust scale removal method called alkaline descaling method.

The formula of alkaline rust remover cleaner is as follows. EDTA 30-50g/L, NaOH100~150g/L, sodium cyanide 50~75g/L, surfactant 0.1~2.0g/L or sodium pyrophosphate 50g/L, sodium hydroxide 150g/L, sodium cyanide 75g/L, surfactant 0.2~7.0g/L.

The specific method is to remove rust and scale at 50~70℃, 5~10A. ~ 70 ℃, 5 ~ 10A / dm2 current density under electrolysis, or in 70 ~ 90 ℃ hot solution impregnation removal. Non-ferrous metals can also be used in alkali descaling, such as treatment of aluminum metal formula: 5% ~ 10% sodium hydroxide, 50 ~ 70 ℃, 15 ~ 60s impregnation treatment.

f Treatment of copper is formulated in 5% ~ 20% sodium cyanide solution immersed in 5 ~ 15s. Acid etching to remove rust will make the metal matrix dissolved and cause the metal material dimensional accuracy deterioration, not passivation treatment is still possible rust, and there is a hydrogen embrittlement of the possibility of such disadvantages.

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