Does aluminum foil rust?

  Does aluminum foil rust?

  This question keeps emerging on sorts of Q&A platforms, which demonstrates people’s eagerness to have an answer. Here we hope to offer what you just need.

  Before getting to the answer, we need to clarify the concept of “rust” first. Rust is a chemical process during which metals get oxidized after being exposed to the air that is full of oxygen, yet this is not enough, for the word usually indicates a state of “decay” of a metal on the surface. Take iron for example, dark brown powder covers the surface of an oxidized iron and falls off under slight exterior forces like wind, rubbing or vibration. This means that the outer layer of iron is ripped away to form ferrous oxide, and because it is porous, oxygen can continue to penetrate to the iron, creating more rust. Eventually, the entire iron object will be converted to rust. Most metals rust in the same way, except for rare ones like aluminium whose oxide is a solid layer attached firmly onto the surface of an aluminium piece. Therefore, aluminium oxide can not be called something like decay in a strict point of view.

does aluminum foil rust

  But if you mean “oxidize” by “rust”, then aluminium foil is likely to get rust soon after being placed in the air. Some metals are more reactive than others and Aluminum is far more energetic to oxidize than iron. The roll of aluminum foil you get in the store is already rusted before you use it.

  So why does it still look shiny? Aluminum forms aluminum oxide. This is an extremely hard material that forms a layer on the surface that is only a few molecules thick. It then prevents more oxygen from getting to the pure aluminum below the oxide layer. Thus if you mean “decay” by “rust”, then aluminum does not rust. It only get oxidized. Magically, the oxidizing process makes it more “corrosion resistant” in a way.

Aluminium foil manufacturing process

  The aluminium foil manufacturing process consists of smelting, rough rolling, intermediate rolling and aluminum foil blank rolling.

  Smelting

  Aluminium ingots are placed into the furnace to get smelted, and aluminium liquid flows into the casting mill through the launder, during which the the refiner A1-Ti-B is added to form a continuous and uniform refining effect. Gases and slags get removed constantly and uniformly by the graphite rotor.

  Rough Rolling

  The aluminum liquid from the first step becomes a billet. The temperature of inflow water in the inner cavity should be kept between 20 and 23 degree centigrade, and that of outflow water between 28 to 32 degree centigrade. The static pressure of the aluminum melt between the rolls is controlled at 0.004-0.005mpa, so as to ensure that the crystal direction {100} of the material is more than 95%, the grain size is less than 5um, and the slab of 6.5-7.5mm is rolled.

aluminum foil manufacturing process

  Intermediate Rolling

  The above slabs are rolled again by cold rolling mill. When the thickness reaches 4.5mm, they are sent to the annealing furnace. After heating to 360 ℃ and holding for 2 hours, they are continuously heated to 580 ℃ and holding for 18 hours. Homogenization annealing is carried out to make the grain size uniform and consistent in direction. Then, the slabs are continuously cold rolled to 0.60mm in cold rolling mill and sent to annealing furnace again, heating to 460 ℃ and holding for 5 hours. When the they cool down to 400 ℃, have them heat preserved for 7 hours to conduct intermediate annealing, and then continue rolling them to 0.3mm thick.

  Aluminum Foil Blank Rolling

  This step uses the four roll irreversible foil rolling mill to roll the above 0.3mm aluminum foil blank into the finished aluminum foil product.

  The aluminium foil manufacturing process above is short and cost efficient. It enables you to produce ultra-thin aluminum foil of advanced level with a small investment scale. Compared with the hot rolling production process, the investment cost is reduced by two-thirds and the operation cost is reduced by more than half.

Haomei supplies aluminium foil 8011, 8021, 1-7-, 1060, 3003 and 8079 of all regular specifications. Welcome to contact us for more information!

Use of aluminium foil in food packaging

  The use of aluminium foil in food packaging includes that in food containers, food bags and sealing liners. This scope alone covers almost all alloys of aluminium foil rolls, including 8011, 8006, 8021, 8079, 3003 and even 5052.

  Why is the food packaging aluminium foil winning so much popularity? Checking out the list of advantages of an aluminium foil related to food packaging: nontoxic, heat insulating, moisture proof, light shielding, excellent for composite, perfect sealing, friendly to ink and so on.

use of aluminium foil for food packaging

  Here is a brief introduction to the use of aluminium foil in food packaging by alloys.

  8006 aluminium foil for food packaging reaches the brush A grade, the plate shape is flat, the surface is clean and no oil. Haomei 8006 aluminum foil is suitable for aerospace wrinkle-free lunch boxes. After stamping, the edges are free of wrinkles and the appearance is smooth and smooth.

  5052 aluminium foil food packaging is one of the commonly used aluminum foil lunch box raw materials.

  8021 aluminium foil for food packaging has excellent moisture resistance, shading and high barrier properties. Non-toxic, tasteless and hygienic, the aluminum foil is widely used as a packaging material after after compounding, printing and coating.

  8079 food packaging aluminium foil boasts a high strength, a good elongation and a good stretchability. 8079 aluminum foil has the advantages of moisture-proof, air-tight, shading, abrasion resistance, fragrance preservation, non-toxic and tasteless, and it is easy to process beautiful patterns and patterns on its graceful silver surface. Because of this, it’s favored by people in food packaging, pharmaceutical packaging, battery soft packs and other fields.

  8006, 3003 and 8011 are all used in aluminium foil, the difference are as followed. 8006 lunch box aluminum foil has high strength and is hot rolled. 3003 aluminum foil and 8011 aluminum foil have low strength and are cast. The elongation and cup convex value of 8006 aluminum foil are higher than 8011, 3003 lunch box aluminum foil. The tensile strength of the 8006 container foil is 10 MPa higher than that of the 8011 aluminum foil, which is slightly lower than that of the 3003 aluminum foil.

Magical aluminum foil usage tips in daily life

  Speaking of aluminium foil usage, you would think of barbecue, cakes or even chocolates. Not enough, baby. Check out the 12 magical uses of aluminium foil sheets in daily life!

  1. WiFi Impprover—The most exciting aluminium foil usage

  If you happen to own a slag WIFI, don’t be depressed. Put the aluminum foil in a serpentine shape, and the signal can be directed.

  2. Door Handle Protector

  Want a brand new door by painting it with a new color but not want to paint the door handle? Wrap it with aluminum foil. It is easy to dismantle, and the engineering quantity is small and easy to operate. Similarly, aluminium foil can be used in any such cases requiring protection of bumps.

  3. Large Furniture Moving

  If you need to move a large piece of furniture in the house, you can put a piece of aluminum foil on the corner of the table and under the cabinet, and then you can push it along So Easy! Remember to put the bright side down and the effect would be better!

  4. Prevent the Steel Ball from Rusting

  Wash the steel ball on the aluminium foil paper or wrap it in aluminum foil to reduce the rust. Mom wants to praise you as a small house clerk.

aluminium foil usage

  5. Amplify the Heating Effect—Bring warmth in winter

  In the winter, if you want to warm the room quickly, put the foil paper behind the heating so that it can be insulated to prevent the hot air from escaping from the wall. However, if you say that you live south of the Yangtze River, would you like to buy an electric heater first?

  6. Banana Protector Aluminium foil—Finally related with food

  Protects the banana head and a hat can lengthen its shelf life.

  7. Clean the Baking Net

  Roll the aluminum foil into a ball and use a clip to wipe the grill. The grilling net will become a lot cleaner.

  8. Sharpening Scissors

  Cut a few sheets of aluminum foil with scissors, and the scissors will be as sharp as a new one!

  9. Remove Metal Rust

  If a metal item gets rusty, you can use the aluminum foil to dip the rusted area with a little water.

  10. Improve the Efficiency of the Iron

  Put the aluminum foil between two sides of a pair of pants, and put the pants on the iron, then you can burn both sides at the same time!

  11. Bag Sealer

  Remaining snacks can be kept better! Put the aluminum foil on the mouth of the snack bag and iron it with the iron. A simple sealer is done!

  12. Battery Converter

  Don’t despair when you get a No. 7 battery instead of a No. 5. Wrap the aluminum foil on the positive side of the battery to ensure good contact. Done!