1070 aluminum sheets, a high-purity commercially pure aluminum product with a minimum aluminum content of 99.7%, are widely used in high-precision electronic components, aerospace wire and cable, chemical equipment linings, and precision instruments. Compared with other pure aluminum series, 1070 alloy has the highest purity, best electrical conductivity (≥64% IACS), and excellent corrosion resistance, especially suitable for high-end precision applications. However, in practical applications such as precision stamping, welding, and long-term use in corrosive environments, specific problems may occur due to its high purity and low strength. Below is a detailed analysis of these common issues, their root causes, targeted solutions, and the core competitiveness of Zhongfu Aluminum’s 1070 high-purity aluminum sheets.
I. Common Problems & Root Causes
1. Low Strength Leading to Precision Deformation
1070 aluminum sheets have extremely low tensile strength (60-95MPa), so they are prone to deformation during precision processing or assembly (such as electronic component stamping, precision instrument installation). The main causes are:
High purity characteristic: The alloy element content is less than 0.3%, and there is no strengthening phase, resulting in low mechanical strength.
Inappropriate processing force: Excessive clamping force or stamping pressure during precision processing exceeds the material's bearing capacity.
Thickness is too thin: For precision parts with thickness ≤0.5mm, the structural stability is poor, and deformation is easy to occur under external force.
2. Welding Porosity & Joint Softening
When 1070 aluminum sheets are used for welded precision components, porosity and joint softening are prone to occur, affecting structural stability and conductivity. The core influencing factors are:
High hydrogen solubility: High-purity aluminum has strong hydrogen solubility, and hydrogen in the welding environment (moisture, oil stains) is easy to dissolve into the weld, forming porosity when cooled.
Weld softening: The welding heat-affected zone undergoes complete recrystallization, and the tensile strength of the joint is reduced by 30-40% compared with the base material.
Impurity introduction during welding: The welding wire or welding environment introduces impurities, reducing the purity and performance of the joint.
3. Surface Contamination Affecting Precision
1070 high-purity aluminum sheets have high surface activity, so they are prone to adsorbing dust, oil stains, or moisture during processing and storage, affecting precision processing and conductivity. The main reasons are:
Poor cleaning: Residual oil stains or oxides on the surface after production are not thoroughly cleaned.
Unclean processing environment: Dust or oil mist in the processing workshop adheres to the surface of aluminum sheets.
Inappropriate packaging: Lack of sealed packaging leads to moisture adsorption and surface oxidation.
4. Edge Chipping During Precision Cutting
When 1070 aluminum sheets are cut into precision parts (such as electronic contacts), edge chipping or burrs are prone to occur, affecting assembly accuracy. This is mainly caused by:
Dull cutting tool: The cutting tool is not sharp enough, leading to tearing of the material edge instead of smooth cutting.
Inappropriate cutting speed: Too high or too low cutting speed causes uneven stress on the edge, resulting in chipping.
Lack of edge protection: No deburring treatment after cutting, and the edge burrs fall off during assembly, affecting precision.
5. Corrosion in High-Purity Corrosive Environments
Although 1070 aluminum sheets have excellent corrosion resistance, they may suffer from intergranular corrosion in high-purity corrosive environments (such as high-purity chemical reactors). The main factors are:
Grain boundary impurity segregation: Trace impurities segregate at grain boundaries, leading to potential difference and intergranular corrosion.
Incomplete surface oxide film: The oxide film on the surface of high-purity aluminum is thin (about 5-10nm), and it is easy to be damaged by corrosive media.
Welding joint vulnerability: The corrosion resistance of the welding heat-affected zone is lower than that of the base material, and corrosion starts from the joint.
II. Key Solutions to Mitigate Problems
1.Optimize processing parameters and tooling
For precision stamping, use high-precision molds with uniform pressure distribution, control clamping force (≤5MPa), and select O-temper 1070 aluminum sheets (elongation ≥25%) to improve formability. For cutting, use diamond tools, control cutting speed (100-150m/min), and adopt minimum quantity lubrication.
2.Strict welding process control
Adopt argon arc welding (TIG) with high-purity 1070 welding wire (purity ≥99.7%), use high-purity argon (purity ≥99.999%), and preheat the base material to 30-80℃. After welding, perform low-temperature annealing (250-300℃) to reduce residual stress and improve joint performance.
3.Strengthen surface cleaning and packaging
Adopt three-step cleaning process (alkali washing → acid washing → deionized water rinsing) to ensure surface cleanliness (oil content ≤5mg/m²); use vacuum-sealed packaging with desiccant to avoid moisture and dust adsorption. Store in a clean, dry environment (class 1000 clean room recommended).
4.Customize anti-corrosion treatment
For high-purity corrosive environments, adopt hard anodizing treatment (oxide film thickness ≥20μm) to improve corrosion resistance; for welding joints, perform post-welding passivation treatment to enhance the protective effect of the oxide film.
III. Reasons for Choosing Zhongfu Aluminum 1070 High-Purity Aluminum Sheets
1.Ultra-High Purity & Stable Performance
Our 1070 aluminum sheets are made of high-purity aluminum ingots (Al content ≥99.8%), with strict control of impurity content (Fe ≤0.12%, Si ≤0.10%). Conductivity reaches ≥65% IACS, and corrosion resistance (salt spray test ≥1500 hours) is better than industry average. All products undergo spectral analysis and precision testing, qualified rate 99.9%.
2.Precision Customization for High-End Scenarios
For electronic components, we provide 1070 aluminum sheets with thickness 0.1-2.0mm and surface roughness Ra ≤0.2μm; for aerospace cables, we offer high-conductivity 1070 aluminum strips with width 5-300mm; for high-purity chemical equipment, we provide 1070 aluminum sheets with hard anodizing treatment. Support precision cutting (tolerance ±0.01mm) and custom packaging.
3.Professional High-Precision Technical Support
Our technical team with 20+ years of high-purity aluminum processing experience provides customized solutions for high-end scenarios, including processing parameter optimization, welding process design, and on-site technical guidance. We have served 300+ high-end customers in electronics, aerospace, and chemical industries.
4.Clean Production & Reliable Supply
Adopt clean production lines (class 1000 clean room) to avoid surface contamination. Annual production capacity of 1070 series aluminum sheets reaches 80,000 tons, with sufficient inventory of precision specifications. Provide door-to-door delivery service for high-value orders, on-time delivery rate 99.8%.
5.Global High-End Market Recognition
Products are exported to Europe, North America, and Japan, serving 100+ high-end distributors and 800+ precision component manufacturers. Hold ISO9001, ISO14001, and SGS high-purity material certifications, customer repurchase rate 92%.
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