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.

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 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.

Based on the analysis of the current situation of aluminum strip foil industry in domestic and overseas, this paper analyzes the development trend of aluminum strip foil industry from four aspects of production specialization, intelligence, green and scale.

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.

This paper introduces the principle of horizontal continuous casting of aluminum alloy, summarizes the research status of horizontal continuous casting technology of aluminum alloy, including the application of electromagnetic field technology, HCCM technology, ultrasonic technology and metamorphic treatment technology in casting molding, and the current research status of the technological parameters of horizontal continuous casting of aluminum alloy. The thinning mechanism of electromagnetic field in the solidification process of aluminum alloy is emphasized. Finally, the development direction of aluminum alloy horizontal casting 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 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.

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.

In this paper, a hex head bolt of hydrogen TC21 titanium alloy with different hydrogen content is cold-headed by a material testing machine. The microstructure and hardness of the hex head bolt are studied by metallographic microscope an micro-Vickers hardness tester. It is found that when the hydrogen content is 0.79wt.%, cracks only occurred on the outer surface of the head of the hexagon head bolt. With the hydrogen content increasing from 0.79wt.% to 0.91wt.%, the cracks of hexagon head bolts in cold heading process increased gradually. At hydrogen contents of 0.79 wt.%, 0.82 wt.%, and 0.91 wt.%, the microstructural morphology of cold-headed hexagon bolts made from TC21 titanium alloy with varying hydrogen contents appeared similar. The content of β phase was higher, while the content of α phase was lower. With the increase of hydrogen content, β grain boundaries gradually became indistinct or even disappeared, and the dislocation density decreased progressively. As the hydrogen content increased, microhardnesses across all regions of the cold-headed TC21 titanium alloy hexagon bolts increased gradually. When the hydrogen content is the same, there is a similar pattern of microhardness variation across the four regions of the cold-headed TC21 titanium alloy hexagon bolts.

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 takes domestic and foreign aluminum processing listed companies from 2017-2023 as samples, analyzes the changing trend, and finds that increasing R&D investment can promote the two-way improvement of physical and monetary labor productivity. It introduces the research and development contents of aluminum processing research and development instituations in domestic and overseas, and gives some suggestions for China’s aluminum processing industry to strengthen research and development to improve productivity.

In this paper, the liquid-solid cast-rolling 1070A/2024 aluminum alloy composite sheet with casting and rolling speeds of 14 m/min, 12 m/min, 10 m/min and 8 m/min are prepared by vertical double-roll casting and rolling mechanism. By means of scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), hardness tester and shear test, the effect of casting and rolling speed on the interface microstructure and properties of liquid solid casting and rolling 1070A/2024 aluminum alloy composite sheet is investigated. The results show that with the decrease of the casting and rolling speed, the intermetallic compounds at the composite interface first increase and then decrease, and the interfacial hardness at the composite interface increases and then decreases, reaching the highest value of 129.5HV0.1 when the casting and rolling speed is 10 m/min. The shear strength changes in a wavy way and reaches a maximum value of 80.7 MPa when the roll speed is 12 m/min.

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.

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 ℃.

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 this paper, the microstructure of C19210 (Cu-0.1Fe-0.03P) alloy annealed at different temperatures is observed, and its tensile strength, microhardness and electrical conductivity are measured. The result show that the recovery and recrystallization of rolled C19210 alloy occur in sequence at 200~500 ℃. The tensile strength of C19210 alloy decreases when the annealing temperature increases, but the tensile strength increases slightly to 416MPa at 450℃ under the combined effects of work hardening weakening, dispersion strengthening and grain size evolution. The elongation and conductivity of C19210 alloy increase with the increase of annealing temperature, and the microhardness decreases. However, due to the second phase precipitation, the hardness increases to 128HV at 400℃ and then decreases rapidly.