Baoshan Iron & Steel Co., Ltd.

Junsheng Wei

Peng Li

Hongxing Chen

Zhangwei Wang

Long Xie

Renyun Yan

Binghu Li

Laminated steel having a low interface bubble rate, comprising: a substrate with a surface roughness of 0.15-0.25 &#x3bc;m and a modified flexible polyester film thermally laminated onto the surface of the substrate. The modified flexible polyester film is obtained by copolymerization modification of ethylene terephthalate with a low-molecular-weight aliphatic polyester. A method for manufacturing the laminated steel having an extremely low interface bubble rate, comprising the steps of: (1) preheating and then heating the substrate; (2) uncoiling the modified flexible polyester film at room temperature, and then thermally laminating same onto the substrate; and (3) cooling and squeeze-drying. The laminated steel having a low interface bubble rate is made of the substrate with a low surface roughness and the modified flexible polyester thermally laminated onto the surface of the substrate, so that the laminated steel has the low interface bubble rate, high product surface quality, excellent adhesion property, and is applicable for forming into deep-drawn containers.

Laminated steel having extremely low interface bubble rate and method for manufacturing same

Provided are a chromium-free surface-treated tinplate, a production method and a surface treating agent thereof. By coating, on the surface of a tinplate, an environmentally friendly aqueous surface treating agent containing 0.1-5 wt % of a zinc salt, 0.1-5 wt % of a zirconium salt and/or a molybdenum salt and 5-30 wt % of siloxane or polysiloxane, a layer of chromium-free passivation film having uniform and dense ingredients and a good performance and being stable is formed on the surface of a tin layer. The passivation film contains 0.1-20 mg/mof zinc, 0.1-20 mg/mof zirconium and/or molybdenum and 0.5-100 mg/msilicon. The passivation film can impart an excellent surface stability, corrosion resistance and paint film adhesion performance to the surface of the tinplate; in addition, contact with food is safe. The tinplate is comparable to chromium passivation in performance, and the production process thereof does not use a chromate, so that a truly green production process of a tinplate is achieved, complying with the requirements of increasingly strict environmental protection laws and regulations.

Chromium-free surface-treated tinplate, production method and surface treating agent therefor

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Shanghai, China

Junsheng Wei