Preparation method of high-tinning-amount tinned plate and product

Abstract

The invention belongs to the technical field of steelmaking, and particularly relates to a preparation method of a high-tinning-amount tinned plate and a product. The method comprises the following steps that cold-rolled strip steel is sequentially subjected to electrolytic alkali washing, electrolytic acid washing, electrotinning, soft melting, passivating and oiling, and the high-tinning-amounttinned plate is obtained; in the electrolytic pickling process, a sulfuric acid aqueous solution with the concentration of 40-50 g / L is adopted as an electrolytic pickling solution; and the temperature of the electrolytic pickling solution is 40-60 DEG C. According to the method, in the process of preparing the high-tinning-amount tinned plate, a series of optimization is carried out on the basisof novel environment-friendly electroplating solution MSA and induction soft melting process technology and aiming at the technical scheme influencing the corrosion resistance index, so that the production difficulty of an existing production process is reduced, and the corrosion resistance of the obtained high-tinning-amount tinned plate is superior to industrial requirements.

Description

technical field [0001] The invention belongs to the technical field of steel materials, and in particular relates to a preparation method and a product of a tin plate with high tin coating amount. Background technique [0002] High tin content tin plate is mainly used for the packaging of canned fruits such as yellow peaches, oranges, lychees, etc., and the tin content is usually required to be 8.4~11.2g / m 2 . When filling, the tinplate is in direct contact with the contents, so the tinplate is required to have high corrosion resistance, and it must pass the pickling time lag value (PLV), iron dissolution value (ISV), tin crystal Particle size (TCS), alloy-tin galvanic value (ATC) and other four special corrosion resistance tests, the test target values ​​should meet the following national standard requirements: PLV≤10s, ATC≤0.12μA / cm 2 , ISV≤20μg, TCS≤9. [0003] At present, more and more tinplate production adopts wet leveling process to produce tinned substrates, but t...

AI Technical Summary

Problems solved by technology

[0003] At present, more and more tinplate production adopts wet leveling process to produce tinned substrates, but the leveling liquid on the surface of the substrate produced under the wet leveling process has a lot of leveling liquid residue, which makes it difficult to control the surface cleanliness, making Decreased corrosion resistance of tinplate with high tin content

Moreover, during the production and transportation process, the tinplate with high tin content is extremely vulnerable to scratches, which leads to the failure of ATC and ISV indicators

[0004] In addition, at home and abroad, there are few researches on the production method of MSA soluble anode tin plating process combined with induction reflow process to produce high tin content tin plate, but the existing production process is difficult to produce, and the corrosion resistance of the obtained high tin content tin plate Cannot meet industry requirements