This paper reviews the development history of Chinese aluminum industry, classifies and summarizes the waste aluminum alloy, analyzes the social quantity of domestic waste aluminum alloy resources from multiple angles, and predicts the increment of waste aluminum alloy (recycled aluminum) resources in the next ten years (2026-2035). The problems existing in the development of domestic waste aluminum alloy recycling industry and how to achieve benign development in the future are put forward.

In this paper, NH4HF2 is used as pickling agent and H2TiF6/H2ZrF6 as passivation agent, the pickling/ TiZr passivation treatment process of 5182 aluminum alloy surface is analyzed through orthogonal test and the content of Ti and Zr elements on the substrate surface. The results show that the optimum parameters of pickling passivation process are as follows: pickling F-concentration is 400ppm, passivation solution pH is 4.1, treatment time is 4.2 s, conductivity is 2 300 μs/cm; the contents of Ti and Zr are 5.48 mg/m2 and 4.79 mg/m2, respectively.

In this paper, the research results of additive manufacturing titanium alloy in recent years are reviewed, and the research process at home and abroad is summarized from two aspects: the study of microstructure and properties, the influence of different methods on microstructure and properties, and the next research is prospected.

This paper introduces the common classification of the melting&holding furnace, and some auxiliary facilities closely matched with the melting&holding furnace. By introducing some new combustion technology in the melting&holding furnace, the development direction of the melting&holding furnace is introduced. This paper describes the related technology of the furnace systematically, and points out that the furnace development direction of the furnace is reducing burning loss, saving energy, safety and environmental protection and intelligence.

In this paper, the latest research progress of friction stir welding of aluminum alloy is summarized. This paper reviews the latest research results at home and abroad in recent years from three aspects: welding simulation research, the influence of welding parameters on weld microstructure and properties and the research on friction stir welding properties of aluminum alloy. Finally, it is pointed out that friction stir welding of dissimilar aluminum alloys is the focus and direction of the next research.

This paper expounds the harm and potential value of aluminum ash, introduces the comprehensive utilization technology of aluminum ash resources, and analyzes the application prospect and existing problems of aluminum ash.

In this paper, the reaction mechanism, corrosion resistance mechanism and sealing technology of electroless plating Ni-P are introduced. At the same time, the three major trends of rare earth catalysis, multi-metal codeposition and multilayer composite of electroless plating Ni-P technology are summarized, and the future development of electroless plating Ni-P technology is prospected.

This paper introduces the application of oxygen-fuel combustion technology in aluminum smelting furnace. The innovation application of this technology in the aluminum smelting industry, as well as the design and improvement of equipment and process parameters, and the control of tons of natural gas consumption, combustion efficiency, burning loss of liquid aluminum, flue gas emissions, etc., can improve the above indicators.Therefore, it is proved that the oxygen-fuel combustion technology can be applied to the aluminum industry and achieve the effect of improving the combustion efficiency and optimizing the cost of aluminum melting furnace.

In this paper, the residual stress of ZTC4 titanium alloy plate after different cutting amount and different aging methods is measured, and the influence of cutting amount and different aging methods on the residual stress of ZTC4 titanium alloy plate is compared and analyzed. The results show that the value of residual stress introduced by cutting is positively correlated with the amount of cutting, while the increase of the amount of cutting is small. Under the experimental conditions, the effect of vibration aging and thermal aging on the stress relief of ZTC4 titanium alloy is similar. For vibration aging and thermal aging, the larger the residual stress value before aging, the more stress can be removed by aging, and the higher the stress removal rate.

This paper conducts on experimental study on evaporation heat transfer of 9 inner-threaded copper tubes with different tooth profile parameters under air conditioning conditions. The experiments show that the average convective heat transfer coefficient of the tube with 56 racks increased by 9.91% compared to that with 70 racks. The average convective heat transfer coefficient of the stepped teeth increased by 14.18% compared with that of the normal teeth. The average convective heat transfer coefficient of the same copper tube in refrigerant R32 increased by 59.43% compared with that in refrigerant R22. Therefore, it provides support for the development of new types of inner-threaded copper tubes.

Phosphoric acid and sulfuric acid mixture with high voltage for a short time as the first step of oxidation, sulfuric acid, tartaric acid and molybdenum-containing compound mixture with low voltage for a long time as the second step of oxidation, and the two steps of oxidation combined to produce a "trumpet" porous layer with large and shallow opening and narrow and deep bottom on the surface of aluminum alloy.The porous layer is characterized by scanning electron microscopy and EDS spectrometer.Through high-temperature baking and 3C industry general oxide film test method, the performance of sealed oxide film is tested.The results showed that: the "horn type" porous layer oxide film obtained by two-step oxidation can withstand 200℃ high temperature for more than 2 h after sealing, neutral salt spray through 72 h of testing, acid and alkaline artificial sweat through 48 h of testing, zebra pen, cleaning resistance can meet the industry requirements.

In this paper, TA10 titanium alloy is cooled with furnace at different temperatures. The effects of furnace cooling temperature on the microstructure and tensile properties of TA10 titanium alloy are studied by means of optical microscope, scanning electron microscope and room temperature tensile properties test. The results show that the furnace cooling temperature will affect the content of primary α phase and secondary α phase in the microstructure. With the increase of furnace cooling temperature, the content of primary α phase decreases, the content of secondary α phase increases, and the strength of the alloy increases, but the plasticity decreases with the increase of furnace cooling temperature. When the furnace cooling temperature is in the two-phase region, the micro-morphology of the tensile fracture is composed of a large number of equiaxed dimples. When the furnace cooling temperature is in the single-phase region, the fracture morphology is mainly rock-like. In the process of increasing the furnace cooling temperature, the number of micro-cracks in the fracture morphology increases, and tear ridges appear.

Abstract: Based on the perspective of market supply dependence on demand, using existing and future capacity data, this paper analyzes the layout of lithium battery manufacturers plants and aluminum foil production enterprises in various provinces and cities across the country. The results show that the gap of battery aluminum foil in China is 543.6kt, Sichuan, Ningxia and other provinces completely rely on imports, and Guangdong, Chongqing and other provinces oversupply. For the new battery aluminum foil project, the best regional layout is given, and the development suggestions are provided to the existing enterprises.

Abstract: Starting from the actual needs of digital transformation of nonferrous metal processing enterprises, this paper discusses the overall framework of nonferrous metal processing digital factory with industrial internet platform as a unified base. From the four aspects of equipment automation, production digitization, operation digitization, data security protection to carry our research, put forward the construction of nonferrous metal processing digital factory ideas, enabling nonferrous metal processing enterprises to improve production efficiency, optimize product quality, enhance equipment operation guarantee, reduce production energy consumption, strengthen safety production, improve competitiveness.

This paper analyzes the key technology to ensure the smooth operation of the stacker, and puts forward the optimization and improvement measures, which can provide technical reference for the design and performance improvement of related equipment in the same industry.

In order to investigate the influence law of homogenization process of hot-rolled 1xxx aluminum alloy on the microstructure and properties, the microstructure of the alloy was characterized by metallographic microscope and scanning microscope. It was found that under the homogenization condition of 580 °C×12 h, with the extension of the holding time, the grain size of 1xxx aluminum alloy continuously grew and the second phase gradually dissolved. The hardness reaches its peak at 12 h. By comparing the microstructure and properties of the finished aluminum foil produced by the two homogenization processes of 580 °C×12 h and 580 °C×6 h, it was found that extending the holding time had a relatively small effect on the grain size of the finished aluminum foil, but it was beneficial to reduce the size and area proportion of the second phase, thereby improving the elongation of the finished aluminum foil.

In view of the problems such as leakage and rupture caused by erosion wear and corrosion, the influence of bending angle, curvature radius, fluid velocity, particle size and mass flow on the maximum erosion rate of titanium alloy elbow pipe are analyzed by finite element simulation software in this paper. The simulation results show that the area prone to erosion wear is mainly distributed in the outer area of the inner wall of the elbow, and with the increase of the bending angle, the position of the area prone to erosion is gradually closer to the outlet. The maximum erosion rate decreases with the increase of curvature redius, the change of maximum erosion rate is more sensitive to the velocity of low velocity fluid. The influence of particle size on the maximum erosion rate is determined by both the quality of sand and the quantity of sand, and the change of particle size does not change the location of the erosion-prone region. The maximum erosion rate increases with the increase of mass flow rate, and eventually tends to be flat. Finally, from the perspective of bionics, using the natural desert red willow bark as the bionic prototype, the structure of the erosion-prone parts is optimized to extend the service life of the titanium alloy elbow pipe.

In order to further investigate the melt flow and solidification heat transfer law in the molten pool during casting and rolling, reveal the generation mechanism of cracks and other defects of cast-rolled 6061 aluminum alloy, and provide reliable theoretical guidance for improving the cast-rolled 6061 sheet, a coupling model of casting roll-cooling water-molten pool was established by using three-dimensional modeling software SolidWorks. The heat transfer and cooling between molten pool, cooling water and casting roll are described, and the heat transfer equations and boundary conditions required for simulating each physical site are determined. The periodic distribution of temperature field and flow field in molten pool is reflected in the form of cloud diagram and flow diagram. The influence principle of casting billet quality is discussed, and the accuracy of calculation is proved by experiments. The results show that the surface eddy current makes the height of Kiss point different in the direction of the width of the molten pool, the exit temperature of the edge is 239.6 ℃, and the exit temperature of the central part is 301 ℃. The center and edge Kiss points are low, and these parts are prone to cracks. The maximum speed of the flow line at the rod sleeve is 16.94 m/s, and due to the difference in the inflow Angle of the cooling water, under the rotation of the casting roll, the flow rate of the cooling water changes alternately in the direction of the circumference of the casting roll according to 1/4 cycle, and the cooling temperature difference between the two adjacent cycles is about 30 ℃.

The effects of Zr and homogenizing heat treatment on the microstructure and properties of 5083 aluminum alloy cast-rolled plate are studied by means of OM, SEM and hardness test at room temperature. The results show that Zr and Al elements combine to form rod-like Al₃Zr phases interspersed at the grain boundaries can effectively inhibit the recrystallization of tissues. After homogenization at 470℃/14 h, the plasticity of the cast rolled sheet is the best, and the hardness, tensile strength, yield strength and elongation of the edge and core of the cast rolled sheet are 72.82HV0.1 and 63.15HV0.1, 100.13 MPa, 82.27 MPa and 16.92%, respectively.

This paper presents the application of aluminum alloy profiles in automotive threshold beams. The structural performance of threshold beams such as stamping and integral aluminum alloy is compared, and the alloy characteristics of 6008 (with excellent extrusion and energy absorption) and 6082 (with high strength and corrosion resistance) are analyzed. By combining three types of vehicle cases, this paper elaborates on the realization of lightweight and safety synergy through multi-chamber design, laser welding, etc. Although it faces challenges such as high initial costs and complex aluminum-steel connections, with the advancement of lightweighting and electrification in the industry and the research and development of new materials, its application scale will expand, contributing to the high-performance and sustainable development of automobiles.