A kind of 6-series alloy anodized aluminum plate and strip for mobile phone frame and preparation method thereof

Abstract

The invention belongs to the field of preparation of aluminum and aluminum alloy, and particularly relates to a 6-series alloy rolled aluminum board strip and a preparation method thereof. The 6-series alloy rolled aluminum board strip can meet the requirement that the yield strength is larger than or equal to 300 mpa of the mobile phone frame, and no obvious bank marks are generated after anodizing. The ingredients of alloy comprise 0.5-0.7% of Si, 0.08% of Fe, 0.45-0.55% of Cu, 0.1-0.2% of Mn, 0.8-1.0% of Mg, 0.025% of Ti and the balance AL and inevitable impurities, wherein Mg / Si is equal to 1.3-1.6. The product has the characteristics of high strength and an excellent anodizing appearance, after the product is subjected to aging thermal treatment, the yield strength exceeds 300 mpa, due to strip type production and high thickness progress, the strip is very suitable for directly obtaining products shaped like a Chinese character 'kou' in a coiled material continuous stamping manner, the cost is reduced by greatly reducing CNC, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of preparation of aluminum and aluminum alloy strips, and in particular relates to a 6-series alloy anodized aluminum strip for a mobile phone frame and a preparation method thereof. Background technique [0002] With the advent of the 5G network era in the electronics industry, in order to avoid the interference of the metal shell of the mobile phone on the 5G signal, the design of the mobile phone has gradually changed from the integration of the back cover and frame metal to the direction of frame metal, back cover glass or plastic. In order to better protect the whole machine from being damaged during an accidental drop, the frame material of the mobile phone is required to have a sufficiently high strength. Considering the high cost of stainless steel processing, the oxide film is easy to fall off when the 7-series alloy is anodized, and the 6-series alloy is gradually becoming the most popular choice for mobile p...

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Problems solved by technology

[0003] In the prior art, there are generally two methods for the 6-series alloy mobile phone frame material: the first is to use a plate-shaped extruded profile with a "one" cross-section, and the frame is made after full CNC machining, but the use of this During the production of the method, the cost of CNC processing is high, the production time is long and the efficiency is low. It is understood that there are few products that can meet the requirements of high surface anodizing quality among the current high-strength 6-series alloy extrusion materials; the second type is also obtained by extrusion , but the section obtained by extrusion is "mouth" shape, that is, the extruded edge is the frame of the mobile phone, but this method is not suitable for producing low-strength products of alloys similar to 6063 that do not contain Cu (the surface hardness is about HV80 after aging heat treatment) ), the obtained product can meet the requirements for the appearance of the anode, but when extruding and producing a product containing more than 0.3wt% Cu and having a surface hardness exceeding HV110 after aging, due to the particularity of the extrusion die, welding lines must exist. There will be different colors after the anodization of this part, so this production plan is not suitable for the production of high-strength 6-series alloys

[0004] At present, some rolled aluminum strip manufacturers in the industry have realized the production of 6063 alloy by aluminum strip rolling by optimizing the alloy composition, and can meet the general needs of electronic product appearance parts. The yield strength is far less than 300mpa, as disclosed in patent CN 106868435 A, which prevents the product from being widely used on mobile phone frames; some aluminum alloy manufacturers have further improved the yield strength of rolled plates through composition and process improvement, such as patent CN107338375 A A 6-series aluminum alloy and its processing method are proposed. After anodizing, the appearance of the grain is better, but the yield strength is only close to 270mpa, which is still far from the lower limit requirement of 300mpa;

[0005] In the field of extrusion materials, there are relatively more high-strength 6-series alloy anodized aluminum sheets and strips. There is also patent CN107385290 A which discloses a high-strength aluminum alloy with excellent oxidation effect and its preparation method and application. The yield strength even reaches 380mpa, but unable to meet continuous stamping production

Another patent CN103882271A discloses a high-strength and high-elongation AL-Mg-Si-Cu alloy material and its preparation method. The yield strength also reaches 370mpa, but the invention does not mention whether it meets the requirements of the anode, and whether it can be used for continuous stamping Production