Tin plate, also known as tin plate, commonly known as tinplate, is a low-carbon steel plate with tin on both sides. So far, tinplate is the most popular can-making material, followed by aluminum. Tinplate has a bright appearance, good anti-corrosion ability and can-making process performance, easy to process, suitable for coating and printing iron treatment. Tinplate is widely used in food packaging tin boxes such as moon cakes, candies, biscuits, tea, donkey-hide gelatin, etc., as well as in boxes and cans such as certain cosmetics, gifts, and medicines.
1. The production process and performance of tinplate
The tinplate of tinplate mostly adopts acidic electroplating process. The surface of the plate is silver after tin electroplating. The thickness of this coating is approximately 0.4~4 microns. After the tinplate is electroplated, there will be many voids in the coating, and the corrosion resistance is low. Therefore, it is necessary to carry out reflow treatment or passivation treatment after electroplating, so that tin oxide layer is produced on the surface to make the plating layer brighter, and to enhance the adsorption force of the plating layer and the plate and improve the corrosion resistance.
The production process of tinplate: pickling thin steel plate-tin electroplating-softening treatment-passivation treatment-oiling-inspection-shearing-classification-packaging
The metallographic analysis of the tinplate has five layers:
1) Steel base plate. Generally used in can making, its thickness is roughly 0.2~0.3mm
2) Tin-iron alloy layer. It is a tin-iron alloy structure, and the tin content of electroplated tin is less than 1g/m2.
3) Tin layer. Pure tin layer, tin plating amount of tin plate is 5.6g/m2~22.4g/m2.
4) Oxide film layer. Mainly elements such as stannous oxide and tin oxide.
5) Oil film layer. It is cottonseed oil or dioctyl diacid.
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