Standard : GB/T2520-2000, JIS G3303-2002, DIN EN10203, BS EN10202
Annealing: BA, CA
Certification: ISO9001:2008, MTC
Thickness: 0.15 ~ 0.50mm
Width: 500 ~ 1150mm
Temper:T1 ,T2, T2.5，T3, T4, T5, DR8
Coating :1.1/1.1, 2.2/2.2, 2.8/2.8, 5.6/5.6, 2.8/5.6,11.2/11.2
Finish: Stone, Bright, Silver, Matte
Treatment：DOS oil, 4 ~ 6mg/m2
Tinplate is widely used by the packaging industry. Frequently, this material is employed to make cans for packing food, beverages and aerosol products. The tinplate cans are fabricated from low carbon mild steel sheet with a thin coat of electrodeposited tin. The surface of the tinplate is normally coated with a lacquer to improve the corrosion resistance of the container.
Corrosion of lacquered tinplate cans in different solutions was assessed using electrochemical methods. Samples with and without lacquer coating were exposed to different solutions and their susceptibility to corrosion was evaluated using cyclic voltammetry, Tafel curves and electrochemical impedance spectroscopy. The possible formation of a passive layer on the container surface was evaluated according to the kind of hysteresis presented in the fi rst cycle of voltammeter measurements.
Tafel plots showed how the behaviour of the tin layer can change from anodic to cathodic depending on the nature of the solution in contact with it, revealing the risk of localized corrosion. The effect of one additive in the solutions on the electrochemical performance containers was evaluated by electrochemical impedance. The impedance showed a deleterious effect of the additive, and corrosion processes appeared more quickly in containers packed with solutions modifi ed with additive.
The anti-corrosion performance of lacquered tinplate cans depends on the barrier properties of the lacquer and on the nature of the canned products. When the lacquer used does not produce an effective barrier action, the corrosion of tinplate depends on the electrochemical interaction between tin and canned products. According to potential-pH diagrams, tin can form very stable oxides and hydroxides in natural environments which can protect the metal from further corrosion. Additionally, the high hydrogen over-voltage of tin leads to very low corrosion rates of the metal when exposed to a reasonable pH range. However, tin has the ability to form soluble complexes with certain anions. When this occurs the corrosion of tin is accelerated.
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