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 also many parts that are difficult 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 processes include zinc alloy passivation, galvanizing 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 - electroplated pearl chromium. The pearl chrome film has high hardness, good wear resistance, and has anti-corrosion properties of stainless steel. 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 aluminum alloy door and window hardware, 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 widely used instead of 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. 2, the corresponding surface treatment 1) Metallized protective layer plating It is necessary to prepare a conductive aqueous solution as a raw material of the plating layer, and then place the hardware in a plating tank containing the above solution (the portion not to be plated can be sealed with an insulating varnish), under the action of the #l-/JII electric field, A film of a material contained in the solution is deposited on the surface of the hardware, a process called electroplating. The film deposited on the surface of the hardware is called a plating layer. The material of the plating layer may be metal or non-metal. Practice has shown that the electroplated layer formed on the surface of the hardware is not only beautiful and smooth, but also has a high bonding strength with the base metal under the plating layer, and the plating layer is not easy to fall off. In addition, this decorative layer is also resistant to corrosion, oxidation and long life. The price is several times to several tens of times higher than unplated hardware (related to the price of the plating material and the difficulty of the plating process). Electroless plating The raw material as the plating material is made into a solution, and then the hardware to be plated is immersed in the above solution, and the raw material in the solution is deposited on the surface of the hardware to form a plating layer by using a suitable reducing agent. This method of using a chemical reaction method to obtain a coating for a hardware is called electroless plating. Compared with electroplating, electroless plating does not require power supply and electroplating equipment. It can also be plated with both metal and non-metal plating. The cost is lower than electroplating, but electroless plating forms a coating on the surface of the hardware, regardless of its corrosion resistance and oxidation resistance. The durability, durability and bonding strength with the matrix material are both worse than those of the plating. In addition, the thickness of the electroless plating layer is generally thinner than that of electroplating, and the hardness of the plating layer is also lower than that of electroplating. This kind of electroless plating is difficult to distinguish between the electroplated layer and the electroplated layer. Only professionals can check it with special equipment. However, the simple test method on the spot is to grind the surface of the two coatings with sandpaper. Since the hardness of the electroless plating is low, the wear marks are wider and deeper than the plating layer. Brush plating Brush plating is a special type of plating. Different from ordinary electroplating, the plating does not require a plating bath, but a plating solution is supplied to the surface to be plated, and a plated layer is obtained by rubbing the surface of the part with a charged plating brush (also called a plated pen). Since there is no need for a plating bath, it is also called slotless plating. Brush plating is a particularly economical and convenient simple plating method. The power supply and equipment are also very simple, and can be constructed by one person in any simple environment, which is convenient for individual operators. Brush plating can not only plate various shapes of hardware, but also the plating speed is much higher than electroplating and electroless plating. At the same time, it can repair (complement) the damaged metal surface coating with a minimum thickness of 1 ̈m and the thickest. Up to 2 ram ~ 3 ram, as far as the current technology is concerned, brush plating also allows the metal to be plated with various metal and non-metal layers that can be plated by electroplating and electroless plating. It is worth noting that in addition to the appearance of the brush plating, other properties (such as wear resistance, corrosion resistance, oxidation resistance, durability and bonding strength with the base metal) can not keep up with the plating layer, and can not keep up with the electroless plating. In addition, the brush plating and the plating layer can only be identified by special equipment. Usually, with a magnifying glass, the surface of the brush plating layer is not as smooth and shiny as the plating layer, and the thickness of the plating layer is not as uniform as that of the plating. 2) Non-metallic protective layer Surface oxidation treatment The surfaces of steel and aluminum hardware are easily oxidized in air. The former will produce a layer of loose rust. This layer of rust is not only unsightly, but the air will continue to be loaded with the underlying base steel through this layer of rust until the entire steel plate becomes rust. A slightly grayish white oxide film is formed on the surface of the aluminum. Although the oxide film on the surface of the aluminum material is relatively dense, the underlying aluminum matrix can be substantially prevented from being further loaded, but the original silver-white gloss is more severely damaged. In order to prevent the occurrence of the above two phenomena, in addition to the protective decorative layer, an artificial oxide film can be artificially fabricated on the surface of the newly fabricated hardware. Surface of steel hardware The oxide film is generally prepared in an alkali solution. After oxidation treatment, a blue-black dense Fe20 oxide film (up what is commonly referred to as baked blue) is formed on the surface, and a uniform texture of A120 and oxide film is formed on the surface of the aluminum hardware. The artificially formed oxide film on the surface of steel and aluminum hardware is not only beautiful, flat and dense, but also has a much higher bonding strength with the substrate and is difficult to grind. This oxide film also prevents the underlying metal from further corroding by the action of air or other harmful gases. Since such an oxide film on the surface of steel and aluminum hardware has lost its original metal property to become non-metal, it is also called a non-metallic protective decorative layer. Surface coating The non-metallic protective decorative layer sprayed on the surface of metal hardware is currently mainly made of plastic and paint. The color of plastics and paints can be said to be all-encompassing, which is usually beyond the reach of metal decorative layers. However, the main disadvantages of plastic and paint layers are their poor resistance to oxidation and UV rays, which gradually age and become brittle over time, losing the original bright color, beginning to darken and cracking and falling off. In addition, they The bonding strength with metal is not as high as that of metal plating, and it is easy to wear off. Therefore, it is not suitable for protective decorative coatings as moving parts. In order to improve the performance of the paint on the metal surface, the paint layer of the hardware is mostly made of amino baking varnish (paint). For special performance requirements such as oil, insulation, and fluorescence, these special paints can also be applied. For the hardware that sprays plastic and paint protective decorative layers, it is mostly used for furniture below mid-range. 3, using double layer anti-corrosion At present, the materials used in aluminum alloy door and window hardware fittings are carbon steel, such as transmission lockers and lining steel. For carbon steel, the main cause of corrosion is insufficient thickness of the galvanized layer. For carbon steel plating, it is required to increase the thickness of the galvanized layer. At the same time, the post-treatment process should be strengthened, and the inorganic salt such as silicate or organic film should be used for covering, which can greatly improve the corrosion resistance of the galvanized layer. After the closure, the original rainbow colored passivation film becomes golden yellow. Some parts in the hardware parts are stamped and painted on the surface of the steel plate. Such products can be tested for up to 1000 hours in a neutral salt spray test, but in practical use these products have poor corrosion resistance because they are mainly covered by organic film to achieve rust-preventing performance, once the coating is destroyed. The base metal quickly corrodes. In practical use, especially during the installation process, it is inevitable to scratch the surface of the cover layer, especially at the edges and corners, and these parts are particularly thin due to the edge effect. It is recommended to use a galvanized layer as a pre-treatment of the spray so that even if the organic cover is destroyed, there is a galvanized protective layer inside. Practice has proved that the corrosion resistance of the product after this process will be greatly improved. Both of the above forms have one thing in common, that is, a double-layer anti-corrosion method is adopted. The former is mainly galvanized and coated with a transparent organic protective film. The appearance is galvanized parts, the latter is mainly made of organic coating, supplemented by galvanized layer, and the appearance is plastic coated parts. 4. Adopt new technologies, new processes, and new materials The adoption of new technologies, new processes and new materials is the only way to improve the corrosion resistance of door and window hardware. Foreign hardware manufacturers use physical vapor deposition (PVD, also known as vacuum plating) to produce hardware parts with excellent appearance and corrosion resistance. Vacuum plating has strong adhesion, and the coating layer is not easy to fall off; the diffraction is good, the thickness of the coating is uniform; the coating is dense, the needles are less L-bubbles; the treatment is easy before plating, the process is simple; the materials are used, and there is no pollution. A simple substance, alloy or compound can be plated on a metal or non-metal surface. It has been widely used in the industrial sectors of aviation, aerospace, electronics and optics to prepare coatings with special properties. With the continuous improvement, large-scale and continuous vacuum coating equipment, and the development of coating technology, decorative coatings with good bonding strength, high abrasion resistance and high brightness can be obtained. In foreign countries, the surface of some accessories such as handles and hinges is vacuum-plated with Au, Ag, Al, Zr, TiN, lCrl8Ni9, etc., and the outer surface with excellent comprehensive performance is obtained, so that the single functional accessories such as handles and hinges become Use functional and decorative dual performance accessories. PVD technology can also change the concept of single-handed metal parts such as handle parts. Many foreign parts, especially the handles, are made of engineering plastics. Due to the injection molding process, labor productivity and product cost can be greatly improved. PVD technology metallizes its appearance. Secondly, new technologies and new processes such as fluorocarbon spraying and cathodic electrophoresis have been applied in aluminum alloy doors and windows, and aluminum alloy doors and windows with excellent aging resistance and corrosion resistance are produced, so that door and window fittings are also With the continuous improvement of profile performance, the surface treatment process of single galvanizing and spraying should be changed, and new technologies, new processes and new materials should be adopted as soon as possible. Aluminum alloy doors and windows are used by more and more buildings because of their beautiful appearance, flexible opening, convenient use, light weight and large lighting area. Doors and windows are often improved with the technical progress of hardware accessories to improve their functions. of. Due to the characteristics of aluminum alloy which is easily passivated under natural conditions, when the hardware is made of general metal materials, the structure of aluminum alloy doors and windows will be a combination of large cathode and small anode. How to avoid or reduce galvanic corrosion is the best choice for aluminum or aluminum alloy. There are many stainless steel grades, and the varieties with better corrosion resistance should be selected. Carbon steel should be added with an insulating layer or a non-metallic coating to effectively prevent electrochemical corrosion. Especially in today's industrial rise in the world, the dangers of industrial atmosphere to doors, windows and hardware have become quite common. The choice of hardware materials and proper surface protection have been valued by the industry. In recent years, aluminum alloy profiles have been improved in many aspects, such as the use of surface electrostatic spraying, so that the surface color of aluminum alloys is colorful, which also makes aluminum alloy doors and windows play a key role in the rich facade effect of new residential communities, expanding Use space. Functional Masterbatch is one general catagory for all masterbatches which prosses some special functions or performance, such as anti-static, anti-block, PP clarifying, rust-proof, unclearating so on. Its carrier is special polymer, with funcational additives. The colorsare transparent or ivory. Functional Masterbatch Function Masterbatch,Polyethene Masterbatch,Plastic Compounding Masterbatch,Plastic Pigment Masterbatch Anda Masterbatch( Group) Co., Limited , https://www.polymer-masterbatch.com
1, choose the right material