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Aluminum alloy door and window hardware anti-corrosion measures

Update:10-08-2019
Summary:

Use the right materials 1) Use materials similar to the […]

Use the right materials
1) Use materials similar to the potential difference of aluminum profiles
It is one of the best choices to use materials that are close to the potential difference of the aluminum profile or to use materials with better corrosion resistance, such as aluminum alloy handles, hinges and various connectors. This combination of the same metal is an ideal design to avoid the generation of self-coupled cells. However, there are many parts that are not easy to use aluminum and aluminum alloys because of strength or difficulty in production. Therefore, stainless steel with good corrosion resistance should also be one of the preferred materials. Stainless steel generally has an anti-rust effect as long as the Cr in the steel is greater than 12. However, in steel, which contains only a single element of Cr, the corrosion resistance is not very good and it is easy to rust. Only steel contains titanium, which promotes the stability of carbides, and has high corrosion resistance, such as 1Crl8Ni9Ti. Stainless steel with good corrosion resistance is generally composed of chromium, nickel, titanium and other components in steel. It is a complex galvanic cell structure and therefore has good chemical stability. In many acid, alkali, and salt solutions, corrosion resistance is high in organic acids, steam, and humid air. The use of stainless steel reduces or avoids the susceptibility of galvanic corrosion of the profile.
2) Use zinc alloy and make appropriate surface treatment
Zinc alloy is widely used in door and window hardware due to its simple manufacturing process and low cost. Zinc alloys are susceptible to corrosion in acid, alkali, and salt solutions, but are easily passivated in the atmosphere and have good oxidation resistance. The surface of zinc alloy parts is generally coated with metal or non-metal. The typical treatment process includes zinc alloy passivation treatment, galvanization passivation, painting, spray powder, etc. The former has good wear resistance and passivation film. It has certain acid and alkali resistance and can prolong the corrosion resistance time of parts. The latter is a non-metal film layer with good insulation and can avoid galvanic corrosion. There is currently a surface treatment method on the market - electroplating pearl chromium. The pearl chrome film has high hardness, good wear resistance, and has stainless steel anti-corrosion performance. The appearance is elegant, generous and beautiful. Regardless of the anti-corrosion angle or the choice of appearance, pearl chrome is one of the best surface treatment methods for aluminum alloy doors and windows.
3) More choice of stainless steel
Exposed ordinary carbon steel hardware is generally not suitable as an aluminum alloy door and window hardware material, because carbon steel itself does not have surface passivation performance, and is a sacrificial anode in aluminum alloy doors and windows during electrochemical corrosion. A better measure is to add an insulating material or a non-metallic coating to the contact portion of the aluminum profile after the surface is coated with the metal film layer to avoid or reduce the damage of the galvanic corrosion to the hardware. Stainless steel has excellent corrosion resistance, and stainless steel should be promoted to replace carbon steel to make door and window fittings. However, in the current hardware product standards, only products such as sliding supports are clearly specified to be made of stainless steel. Stainless steel hardware is not optimistic in domestic use, although early
It is also made of carbon steel and plastic coated, but now the only thing the user accepts is the stainless steel sliding support. Under the same conditions of use and requirements, such as hinges, drive locks, and supports are mostly made of carbon steel. At present, the domestic hinges are also beginning to be made of stainless steel, and the transmission locks are also made of stainless steel abroad. Therefore, it is necessary to publicize and advocate the production of stainless steel hardware, such as hinges, hinges, transmission locks, etc., especially for the accessories of the outer casement window, carbon steel should be discarded with stainless steel.

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