首页>
外国专利>
SURFACE TREATED STEEL SHEET FOR WELDED CAN, EXCELLENT IN FILIFORM RUST RESISTANCE AND RESISTANCE TO CORROSION UNDER COATED FILM, AND ITS PRODUCTION
SURFACE TREATED STEEL SHEET FOR WELDED CAN, EXCELLENT IN FILIFORM RUST RESISTANCE AND RESISTANCE TO CORROSION UNDER COATED FILM, AND ITS PRODUCTION
PROBLEM TO BE SOLVED: To obtain the surface treated steel sheet for welded can by successively forming an iron-Ni alloy layer, an iron-Ni-tin alloy layer with Ni concentration gradient, an iron-Ni-tin alloy layer without Ni concentration gradient, an island-like or granular tin layer, and a chromate film layer, in respectively specified amounts, on the surface of a steel sheet. ;SOLUTION: After the surface of a steel sheet 1 is subjected to (20 to 200)mg/m2 Ni quantity of Ni plating or iron-Ni alloy plating, heat treatment is performed is a nonoxidizing atmosphere to form an iron-Ni alloy layer 2 and temper rolling is carried out and an iron-Ni alloy plating of 10-30% Ni content and (5 to 50)mg/m2 Ni quantity is applied. Subsequently, tin plating of (500 to 2000)mg/m2 tin quantity in applied and an island-like or granular layer 5 of (100 to 1500)mg/m2 coating weight is formed by means of reflowing treatment, and also, between the layer 5 and the layer 2, an iron-Ni-tin alloy layer 3 composed essentially of iron-tin alloy, having 0.01-0.3μ thickness and also having an Ni concentration gradient in which Ni concentration is decreased with the approach to the layer 2, and a similar iron-Ni-tin alloy layer 4 of 0.001-0.1μ thickness, without Ni concentration gradient, then, chromate layer of 10-50mg/m2 is depositted, are formed. Then, a chromate film layer of (10 to 50)mg/m2 coating weight is formed.;COPYRIGHT: (C)1998,JPO
展开▼
机译:解决的问题:通过依次形成铁-镍合金层,具有镍浓度梯度的铁-镍-锡合金层,无镍浓度梯度的铁-镍-锡合金层来获得用于焊接罐的表面处理钢板。钢板表面上分别指定量的岛状或粒状的锡层和铬酸盐膜层。 ;解决方案:钢板1的表面经过(20至200)mg / m 2 Sup> Ni量的Ni镀层或铁-Ni合金镀层后,在非氧化气氛下进行热处理形成铁-镍合金层2并进行回火轧制,并施加镍含量为10-30%且(5-50)mg / m 2 Sup> Ni量的铁-Ni合金镀层。随后,施加镀锡量为(500至2000)mg / m 2 Sup>的锡和(100至1500)mg / m 2 Sup的岛状或颗粒层5 >涂层重量通过回流处理形成,并且,在层5和层2之间,主要由铁-锡合金构成的铁-Ni-锡合金层3,其厚度为0.01-0.3μ,并且还具有Ni浓度梯度,其中Ni浓度随着接近第2层而降低,并且类似的厚度为0.001-0.1μ的铁-Ni-锡合金层4,没有Ni浓度梯度,则铬酸盐层为10-50mg / m 2 Sup>沉积,形成。然后,形成涂层重量为(10至50)mg / m 2 Sup>的铬酸盐膜层。版权所有:(C)1998,JPO
展开▼