Method of removing patina from cast bronze sculpture and its daily maintenance
Cast bronze sculpture is one of the more metal materials that we can see in our lives. For general metal, its durability is very high, but it can't stand the torture of time. So the cast bronze sculpture is also Those that need maintenance and maintenance, especially the cast bronze sculptures that have not been maintained for a long time, will even grow patina. Below, Beijing sculpture manufacturers will introduce the methods of removing the patina of cast bronze sculptures and their daily maintenance. How to remove the patina of a bronze sculpture 1. Kerosene, tooth powder removal patina method: first wipe it with a cloth dipped in kerosene, and then wipe with tooth powder, the patina can be removed. 2. Vinegar removal patina method: the green patina on the bronze sculpture can be used The cloth is soaked in vinegar, and then wiped with an appropriate amount of salt or cuttlefish bone powder, it can be removed. Add water to the vinegar, and the ratio of vinegar to water is determined by the degree of rust. The heavier the rust or patina or the larger the part, the amount of vinegar should be added accordingly. Large. Vinegar is the acid sold in the vinegar market at home. Slowly brush with a small soft brush. Be careful when washing, and be careful not to hurt yourself with your hands. You can also take a small grain of oxalic acid and place it on the rust stains and drip it. A few drops of warm water, rub it gently, and then wash it with clean water. Be careful to operate quickly to avoid corrosion. If it is a small art sculpture, use acetic acid to wipe the rust stains, or soak the stained part in acetic acid, Rinse it with clean water the next day. You can also use dilute HCl to add dilute hydrochloric acid or dilute sulfuric acid, and then rinse with a lot of water to remove! But note: can not use concentrated sulfuric acid and nitric acid 3. Sea salt derusting method: if sculpture The rust on the bronze sculpture is very serious. You can put sea salt in the molten wax to dissolve it, and wipe it with this solution to eliminate the copper rust. 4. Lemon juice rust removal method: If the copper sculpture is rusty, you can add lemon juice Remove the salt by wiping, you can squeeze out the juice drops on the rust stains and rub it, repeat several times until the rust stains are removed, and then wash it with soapy water. If you want to make it brighter, you can use cigarette-packed tin foil or sawdust to add Some salt wipes, the effect is very good. If it is a small sculpture artwork, a lemon solution or an oxalic acid solution can be used to moisten the rust stains, and then soak in strong salt water, and wash and rinse off the next day. 5. Talc, fine wood Rust removal method: use 160 grams of fine wood, 60 grams of talcum powder, and 240 grams of wheat bran together, pour about 50 grams of vinegar, mix into a paste, apply it to the rusty copperware, and dry it in the air , The patina can be removed. 6. Onion rust removal: If the conditions are limited, you can wipe the rusty bronze sculpture with the cut onion head, and it can also remove the patina. 7. To remove the patina with toothpaste: dip a little with gauze or scouring pad Wipe the patina with toothpaste carefully, do not wash it with water after wiping, just wipe it with a cloth or napkin. 8. Remove patina with rice water: soak it with rice water that has been placed for a few days for several hours and then wash it! After rusting, you must remember to apply a thin layer of oil or petroleum jelly on the surface. 9. Ammonia to remove patina: Use ammonia to remove rust from the copper sculpture, and the effect is very good. Use cotton dipped in strong ammonia to scrub the dark copperware. The surface of the crafts will immediately shine. Because the surface of the copper crafts is scrubbed with concentrated ammonia water, copper oxide, basic copper carbonate and copper sulfide will be converted into soluble copper ammonia complexes and be removed. Copper rubbing water can be combined with Patina occurs The reaction produces a soluble blue copper ammonia complex, thereby removing the patina, but one thing to note is that it should be wiped in time during the rust removal process, or the place without rust will also be easily corroded. Sculpture maintenance 1. Environmental maintenance. The more important thing about the copper sculpture is the environment. The environment it is in is kept dry and free of dust and air pollutants! The temperature of the greenhouse is controlled at 18℃-24℃, and the humidity is at 40%-50%. 2. Defense. When maintaining cast bronze sculptures, learn to defend against some harmful chemicals from the outside world, such as acids, grease, chlorides, etc. You must wear cotton gloves when moving cast bronze sculptures. Direct contact with your hands to avoid being corroded by the sweat on your hands, and you should not use oily paper or boxes to pack. 3. Cleaning When cleaning the cast bronze sculpture, you must not be careful, and be sure to use clean and soft Use cloth pieces to wipe away the dust. For some grooves in the sculptures that are not easy to wipe with a cloth, use a brush or vacuum cleaner to blow away the dust. 4. Maintenance prevent the cast bronze sculptures from being mechanically damaged. They should not collide with each other. Stacking and stacking, for the finely crafted and easily damaged bronze sculptures, more careful maintenance. 5. After the polished cast bronze sculptures are placed for too long, some dullness will appear more or less depending on the environment in which they are placed. At this time, you can gently wipe back and forth with a cotton silk cloth to achieve the polishing effect, so that the protective wax layer on the surface can regenerate. The above is the introduction of the method of removing the patina of the cast bronze sculpture and its daily maintenance. Hope it can help you.