How to deal with rust on the galvalume plate of the oven
There is a sheet metal part with many mesh holes on it. The material is galvalume sheet. After punching, the cut surface quickly rusted. Of course, this is related to the high humidity in summer. Is there any good way to prevent rust? Cannot be powdered or painted.
A small amount of rust can be removed by brushing the rusted area directly with toothpaste, or you can use oxalic acid to corrode the rusted area. This method can be adapted to a large number of treatments.
If you don't have the original paint, you can buy a touch-up pen and use it to apply color. Although this kind of treatment is not as effective as going to a beauty shop, if it is a small or inconspicuous scar, it can also prevent the rust from expanding and aggravating
How to explain the rust of galvalume steel plates
There is black rust on the surface of the galvalume-coated steel plate, and half of it is rusty and the other half is not. What are the reasons for the rust? Causes of rust on the surface of galvalume-coated steel plates. Rust on the surface of steel plates. Galvalume-coated steel plates , galvanized steel plate surface, rusty galvanized steel plate surface
Galvalume sheets and aluminum-plated sheets will also rust outdoors or along the coast. Even the 200 series stainless steel with magnesium, aluminum and zinc, which is a higher level than galvanized sheet, will still rust. Even the 300 series stainless steel, which is a higher level, and 400 series stainless steel, will also rust under certain circumstances.
First of all, judging from the degree of their coating, galvanized sheets are mainly zinc plated on the coating. The coating of galvalume plate not only contains zinc, but also contains an additional amount of aluminum. The surface of galvanized sheet is completely plated with zinc, which protects the material very well and is not easy to rust. As for galvanized sheets, part of the zinc on the surface has been changed to aluminum, so it is prone to oxidation and rust. Therefore, in comparison, galvanized sheets have a longer service life than galvanized sheets.
The rust of galvalume sheets starts from the incision. If you want to prevent this rust phenomenon, use magnesium-aluminum-zinc sheets. It has the characteristics of self-healing incisions and has excellent anti-rust performance. No material is rust-free. Aluminized sheets and galvanized sheets are different in different environments.
Various aspects of whether galvalume steel sheets will rust: It is recommended to use 304 brushed stainless steel for rust-free industrial lifting doors. The surface has a silky texture and looks matte. If you look closely, there are traces of texture on the surface. It is effective. It is very practical to eliminate some scratches on the surface of stainless steel plates.
During the entire service life of galvalume sheets, the first corrosion that occurs is the oxidation of the zinc coating on the surface, forming white rust. After a while, the white rust on the surface further reacts with impurity gases such as carbon dioxide in the humid air, "Black spots" are formed. When the galvanized sheet is used for a long time and the corrosion of the galvanized layer becomes serious, the steel base loses the sacrificial anti-corrosion effect of zinc and begins to oxidize, forming red rust. Once the steel base begins to oxidize, The corrosion rate becomes very fast, and the life of the galvanized sheet ends. In addition, there are two special corrosion conditions of galvanized sheets called black staining. One is that after the galvanized sheet has been used for a period of time, due to the influence of lead and other elements in the galvanized layer, the matte part of the zinc flower will turn black. The blackened galvanized layer still has a protective effect on the steel base. It just has a certain impact on lifespan. This situation has been greatly improved after the current use of lead was stopped and antimony was used to promote the formation of zinc splatter.
Methods for repairing and repairing oxidation and rust on galvanized sheets. If the rust is not very serious, you can first use very fine sandpaper and water to gently remove the rust spots. However, do not grind in any direction. Grind in a straight line in the same direction and polish well. Then wipe it completely clean.
What to do if the galvalume steel plate rusts
Rusty galvalume sheets can only be repaired locally. Grind and remove rust from the rusted parts, and then use hot-dip galvanizing repair paint to repair the galvanized layer. For special repair paint, it is recommended to choose galvanized paint with high zinc content. More than 95% of cold-dip galvanized paint is the best choice.
