Highly corrosion-resistant chrome-free passivated tin plate, manufacturing method thereof, and passivation solution for passivation treatment

Abstract

A highly corrosion-resistant chromium-free passivated tin plate, a manufacturing method thereof, and a passivation solution for passivation treatment, the highly corrosion-resistant chromium-free passivated tin plate includes a substrate, a tin layer on the surface of the substrate, and tin oxide; wherein, the The mass percentage of the chemical composition of the substrate is: C 0.01%-0.15%, Si≤0.05%, Mn 0.1%-0.6%, P≤0.02%, S≤0.03%, Al 0.02%-0.1%, and Fe and Impurities to avoid; Tin weight of tin layer is 0.5‑15.5g / m 2 ;The content of tin oxide is 1.5‑4mC / cm 2 , the zirconium content is 2‑15mg / m 2 , the aluminum content is 1‑10mg / m 2 , P content is 0.5‑3mg / m 2 . The present invention does not use any chromate passivation treatment, the passivation method is simple, the application cost is low, and a tin plate with excellent surface properties and food contact safety can be obtained. Therefore, the method of the present invention can replace the chromate passivation method, The corrosion resistance of the obtained chromium-free passivated tin plate is excellent, comparable to that of the chromium passivated tin plate.

Description

technical field [0001] The invention relates to a tinplate, in particular to a highly corrosion-resistant chrome-free passivated tinplate, a manufacturing method thereof and a passivation solution for passivation treatment. Background technique [0002] The technical field of the present invention is the tinplate (also known as tinplate) product usually used as a metal packaging material and its production technology, specifically the surface treatment technical field of the tinplate. Tinplate, as a metal packaging material coated with a thin tin layer on the surface of the steel plate, is usually used for packaging food or beverages due to its advantages of high strength, good sealing, and strong corrosion resistance, such as fish, meat, vegetables, Fruits and functional drinks are also used in the packaging of some chemical products, such as spray cans or chemical cans. [0003] There are many kinds of contents in tinplate packaging, many of which are corrosive to varying...

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Problems solved by technology

[0010] The above-mentioned technologies are mainly for surface treatment of general-purpose tinplate, which cannot guarantee the performance requirements of high corrosion resistance, and patents (1), (2) and (4) also contain fluorine compounds, phenolic substances and resins The organic compounds used in the production of tinplate for food packaging are still in doubt about the food contact safety

The passivation solution components and passivation methods involved in the above technologies such as patents (3) and (4) are relatively simple, and it is difficult to achieve high corrosion resistance requirements for tinplate under conventional passivation production conditions

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