Acid-proof or acid resistant steel contains iron and chromium, and additionally some nickel and / or manganese as well as smaller quantities of other metals such as molybdenum, niobium and titanium. Acid-proof steel is used in environments with more challenging chemical exposures, such as a maritime environment and when items come in contact with acids. The steel alloy containing both chromium and nickel is also known as nickel-chromium steel. If nothing else is stated in the Catalogue, the classification Acid-Proof Steel refers to the European Standard EN 1.4404, which corresponds to American Iron and Steel Institute standard AISI 316L. For complete material specifications see http://katalog.industrilas.se/?114
Aluminium is frequently considered a non-corrosive metal, but this is not entirely accurate. Aluminium corrodes but between pH 4 and pH 9 it forms a passive oxide film that protects the material. Outside of this pH norm aluminium corrodes quickly. Alloys corrode quicker than pure aluminium, and the fastest corrosion occurs when it contains copper. However, aluminium can handle sulphuric acid, nitrates and acetic acid thanks to the formation of either a passive oxide film or acetates that isolate the aluminium from the oxidizing substance. Upon contact with other metals corrosion can occur if the environment is damp. This is true in for instance contact with copper or iron. Contact with stainless steel is on the other hand harmless under normal conditions. The Industrilas product inventory offers hinges and rod latches made of aluminium.
turns the surface layer of a metal into an insoluble oxide which provides corrosion protection, decorative surfaces, good adherence for enamels and other surface treatments, as well as certain electrical and mechanical characteristics. Aluminium is the most common metal for anodizing, but magnesium, zinc, and titanium are also used for this purpose. The electrolyte solution consists of diluted sulphuric acid or chromium acid.