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In recent years,the concern about environmental protection is increasing on a world scale.Major manufacturers of home appliances and OA equipment have introduced so-called “green procurement schemes” for reducing environmentally harmful substances in manufacturing process and end products. Under such background,a new type of chromate-free organic composite coated electro-galvanized steel sheet with high conductivity was developed by Baosteel,which meets the EU RoHS Directive(Restriction of the Hazardous Substances) and other related laws and regulations on environmental safety.It also provides excellent surface electrical conductivity,corrosion resistance,fingerprint resistance,solvent resistance,coating adhesion, heat resistance,formability and other special properties to meet the demand of manufacture’s process of OA machine. Compared with previously developed anti-fingerprinting coated electro-galvanized steel sheet,this newly developed product has a good balance between high corrosion resistance(time to 5%white rust in salt spray test is 120 h for flat panel and 72 h for worked potion) and conductivity(surface electro-resistivity in accordance with LOREAST is less than 0.1 milliohm ) due to the special design of coating’s structure.Besides,It also provides the properties of grounding and shielding against electromagnetic waves.The evaluation of surface performances of new product showed that it is comparable or even better than the similar products. Currently,the newly developed product has been commercialized. In this paper,the major properties are discussed,such as corrosion resistance,surface electrical conductivity, fingerprint resistance,solvent resistance,coating adhesion(ink/melamine alkyd paint),heat resistance and formability.Furthermore,the application is also briefly described.
In recent years, the concern about environmental protection is increasing on a world scale. Major manufacturers of home appliances and OA equipment have introduced so-called “green procurement schemes” for reducing environmentally harmful substances in manufacturing process and end products. background, a new type of chromate-free organic composite coated electro-galvanized steel sheet with high conductivity was developed by Baosteel, which meets the EU RoHS Directive (Restriction of the Hazardous Substances) and other related laws and regulations on environmental safety .It also Compared with previously developed anti-fingerprinting coated electro-galvanized steel sheet this this developed product has a good balance between high corr osion resistance (time to 5% white rust in salt spray test is 120 h for flat panel and 72 h for worked potion) and conductivity (surface electro-resistivity in accordance with LOREAST is less than 0.1 milliohm) due to the special design of coating’s structure.Besides, It also provides the properties of grounding and shielding against electromagnetic waves. The evaluation of surface performances of new product showed that it is comparable or even better than the similar products. Currently, the newly developed product has been commercialized. In this paper, the major properties are discussed, such as corrosion resistance, surface electrical conductivity, fingerprint resistance, solvent resistance, coating adhesion (ink / melamine alkyd paint), heat resistance and formability.