Electrolytic tinplate sheet is widely used in food, beverage, chemical industry, medicine and other fields due to its excellent anti-corrosion performance, processability and beautiful appearance. However, the quality of electrolytic tinplate sheet on the market is uneven, and how to distinguish its quality has become the focus of attention of enterprises and consumers.
This article will analyze the quality identification method of electrolytic tinplate sheet in detail from the aspects of raw materials, production process, physical properties, chemical stability and appearance inspection.
Composition and manufacturing process of electrolytic tinplate sheet
Low carbon steel substrate
The substrate of electrolytic tinplate sheet is low carbon steel. Low carbon steel has good mechanical properties and ductility, but it is prone to corrosion in a humid environment. A high-quality low carbon steel substrate should have a uniform composition, good surface quality and appropriate thickness.
Tin plating layer
The surface of electrolytic tinplate sheet is plated with a layer of tin. Tin has good chemical stability and corrosion resistance, which can effectively prevent the low carbon steel substrate from direct contact with the external environment, thereby extending the service life of the material. The thickness and uniformity of the tin coating are key factors in determining the quality of electrolytic tinplate sheet.
How to distinguish the quality of electrolytic tinplate sheet?
Raw material quality inspection
High-quality electrolytic tinplate sheet should be made of high-quality low-carbon steel and pure tin. The low-carbon steel substrate should have a uniform composition and good surface quality, and the tin should be free of impurities to ensure the uniformity and anti-corrosion performance of the tin coating.
Inspection method:
● Composition analysis: Detect the composition of low-carbon steel and tin through spectral analysis and other methods to ensure the purity and uniformity of the material.
● Surface inspection: Observe the surface quality of the low-carbon steel substrate to ensure that there are no defects such as cracks, dents, and oxide scale.
Thickness and uniformity of the tin coating
The thickness and uniformity of the tin coating directly affect the anti-corrosion performance and service life of the electrolytic tinplate sheet. High-quality electrolytic tinplate sheet should have a uniform and appropriately thick tin coating, which can effectively prevent corrosion of the substrate.
Inspection method:
● Thickness measurement: Use electromagnetic thickness gauge and other equipment to measure the thickness of the tinned layer to ensure that it is within the standard range.
● Uniformity inspection: Observe the uniformity of the tinned layer through microscope and other equipment to ensure that there is no obvious uneven thickness.
Surface finish and coating quality
The surface finish and coating quality of electrolytic tinplate sheet not only affect its appearance, but also directly relate to its anti-corrosion performance and processing performance. High-quality electrolytic tinplate sheet should have a smooth, flawless surface, and a uniform, highly adhesive coating.
Inspection method:
● Surface inspection: Visually observe and feel the surface of the electrolytic tinplate sheet to ensure that it is smooth, free of scratches, spots and other defects.
● Coating adhesion test: Test the adhesion of the coating through methods such as the hundred-grid test to ensure that it is firm and not easy to fall off.
Physical property test
The physical properties of electrolytic tinplate sheet, such as tensile strength and elongation, are directly related to its processing performance and service life. High-quality electrolytic tinplate sheet should have good mechanical properties and be able to withstand certain stretching, bending and other processing operations.
Inspection method:
● Tensile strength test: The tensile strength of the electrolytic tinplate sheet is tested by a tensile testing machine to ensure that it meets the standard requirements.
● Elongation test: The elongation of the electrolytic tinplate sheet is tested by a tensile testing machine to ensure that it has good ductility.
Chemical stability test
The chemical stability of the electrolytic tinplate sheet, especially its corrosion resistance, is directly related to its service life and safety. High-quality electrolytic tinplate sheet should have good acid resistance, alkali resistance, salt spray resistance and other properties, and can be used for a long time in harsh environments.
Inspection method:
● Salt spray test: The corrosion resistance of the electrolytic tinplate sheet is tested by a salt spray test to ensure that there is no obvious corrosion in the salt spray environment.
● Acid and alkali corrosion test: The acid and alkali resistance of the electrolytic tinplate sheet is tested by an acid and alkali corrosion test to ensure that there is no obvious corrosion in the acid and alkali environment.
Practical application of electrolytic tinplate sheet quality identification
Food and beverage packaging
Electrolytic tinplate sheet is widely used in food and beverage packaging, such as cans, beverage cans, etc. In order to ensure the safety of food and beverages, the quality of electrolytic tinplate sheet is crucial.
● Case analysis: When a canned food company purchases electrolytic tinplate sheet, it strictly controls the quality of raw materials through composition analysis, thickness measurement, surface inspection and other methods. As a result, the canned food produced by the company not only has a beautiful appearance, but also has good anti-corrosion properties, ensuring the safety and quality of food.
Chemical containers and storage tanks
In the chemical industry, electrolytic tinplate sheet is used to make chemical containers and storage tanks. In order to ensure the storage safety of chemicals, the chemical stability and corrosion resistance of electrolytic tinplate sheet are particularly important.
● Case analysis: When a chemical company purchases electrolytic tinplate sheet to make storage tanks, it strictly tests its corrosion resistance through salt spray tests, acid and alkali corrosion tests and other methods. As a result, the electrolytic tinplate sheet storage tanks used by the enterprise have good corrosion resistance, ensuring the safe storage of chemicals.
Pharmaceutical packaging
Electrolytic tinplate sheet is also used for pharmaceutical packaging, such as medicine cans. In order to ensure the safety of medicines, the surface finish and coating quality of electrolytic tinplate sheet are very important.
● Case analysis: When a pharmaceutical company purchases electrolytic tinplate sheet to make medicine cans, it strictly controls the quality of raw materials through surface inspection, coating adhesion test and other methods. As a result, the medicine cans produced by the company have good finish and anti-corrosion performance, ensuring the safety and effectiveness of medicines.
Precautions for consumers and enterprises
Precautions for consumers
When consumers purchase electrolytic tinplate sheet products, they should pay attention to the following points:
Purchase Guide:
● Brand selection: Choose electrolytic tinplate sheet products produced by well-known brands and reputable companies.
● Appearance inspection: Carefully check the appearance of the electrolytic tinplate sheet products to ensure that the surface is smooth, without scratches, spots and other defects.
● Instructions for use: Read the product manual carefully and follow the instructions to ensure the safe use of electrolytic tinplate sheet products.
Enterprise precautions
When purchasing and using electrolytic tinplate sheet, manufacturers should pay attention to the following points:
Purchasing Guide:
● Supplier selection: Select qualified and reputable suppliers to ensure the quality of raw materials.
● Quality inspection: Strictly inspect the quality of raw materials through composition analysis, thickness measurement, surface inspection and other methods to ensure that they meet the standard requirements.
● Production process control: Strictly control the production process parameters to ensure product quality and performance.
Conclusion
Through a detailed analysis of the quality identification method of electrolytic tinplate sheet, the following conclusions can be drawn:
1. sheet should have a high-quality low-carbon steel substrate and a pure tin-plated layer: through composition analysis and surface inspection, ensure the purity and uniformity of the raw materials.
2. The thickness and uniformity of the tin-plated layer are the key factors that determine the quality of electrolytic tinplate sheet: through thickness measurement and uniformity inspection, ensure the anti-corrosion performance and service life of the tin-plated layer.
3. Surface finish and coating quality are directly related to the appearance and anti-corrosion performance of electrolytic tinplate sheet: through surface inspection and coating adhesion test, ensure that it is smooth, flawless and has good anti-corrosion performance.
4. Physical properties and chemical stability tests are important links to ensure the quality of electrolytic tinplate sheet products: through tensile strength test, elongation test, salt spray test and acid and alkali corrosion test, ensure that it has good mechanical properties and corrosion resistance.
I hope this article can help readers better understand the quality identification method of electrolytic tinplate sheet and provide reference and guidance for the production and use of related fields.