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STEEL SUBSTRATE US 8.420,224 B2 Page 2 USOO842O224B2 (12) United States Patent (10) Patent No.: US 8.420,224 B2 Takahashi et al. (45) Date of Patent: Apr. 16, 2013 (54) ZINC-BASED PLATED STEEL SHEET FOREIGN PATENT DOCUMENTS EXCELLENT IN SURFACE ELECTRICAL CN 1613986 5, 2005 CONDUCTIVITY HAVING PRIMARY RUST CN 1668460 9, 2005 PREVENTIVE THIN FILMI LAYER JP 2000-319787 11, 2000 JP 2002080979 * 3, 2002 (75) Inventors: Akira Takahashi, Tokyo (JP); Atsushi E. 583,378 33: Morishita, Tokyo (JP) JP 2004-277876 10, 2004 JP 2005-08978O 4/2005 (73) Assignee: Nippon Steel & Sumitomo Metal E. 585. 858. Corporation, Tokyo (JP) JP 2007-331218 12/2007 TW 200806468 2, 2008 *) NotOt1Ce: Subjubject to anyy d1Sclaimer,disclai theh term off thisthi patent is extended or adjusted under 35 OTHER PUBLICATIONS U.S.C. 154(b) by 37 days. International Search Report dated Apr. 1, 2008 issued in correspond (21) Appl.ppl. NNo.: 12/735,6289 ing PCT Application No. PCT/JP2008/053108. (Continued) (22) PCT Filed: Feb. 15, 2008 Primary Examiner — Jennifer McNeil (86). PCT No.: PCT/UP2008/053108 Assistant Examiner — Daniel J Schleis S371 (c)(1), (74) Attorney, Agent, or Firm — Kenyon & Kenyon LLP (2), (4) Date: Oct. 7, 2010 (57) ABSTRACT (87) PCT Pub. No.: WO2009/101707 A Zinc or Zinc alloy plated Steel sheet expressing a perfor PCT Pub. Date: Aug. 20, 2009 mance provided with both corrosion resistance and Surface conductivity is provided. The zinc or zinc alloy plated steel (65) Prior Publication Data sheet of the present invention is a Zinc or Zinc alloy plated steel sheet having an arithmetic average roughness Ra of a US 2011 FOO27611 A1 Feb. 3, 2011 zinc-plated layer surface defined by JIS B 0601, obtained by a stylus-type surface roughness meter defined by JIS B 0651, (51) Int. Cl. of 0.3 um to 2.0 Lum and a maximum peak height Rp of 4.0 um B32B 3/00 (2006.01) to 20.0 um, wherein the arithmetic average roughness Ra (52) U.S. Cl. (peak) obtained by measuring a range of evaluation length of USPC ............ 428/612; 428/659: 428/621; 428/687 20 um of peak parts of 80% or more of the Rp by an electron (58) Field of Classification Search ........................ None beam 3D roughness analyzer is 70% or more of the arithmetic See application file for complete search history. average roughness Ra (average) obtained by measuring a range of evaluation length of 20 um of parts of a height of (56) References Cited t20% about an average line, obtained by a stylus-type surface U.S. PATENT DOCUMENTS roughness meter, by an electronbeam 3D roughness analyzer. 2005/0244660 A1 11/2005 Yuasa et al. 3 Claims, 3 Drawing Sheets ... 88 S. Y. ...-ij-i S. ii. RANG AYER STEEL SUBSTRATE US 8.420,224 B2 Page 2 OTHER PUBLICATIONS Zhu et al., “Effects of High-Speed Zinc Plating on Coating Rough ness and Texture.” Electroplating & Pollution Control, vol. 24. No. 4. “Geometrical Product Specification (GPS)—Surface texture: Profile Jul. 2004, pp. 14-16. method Terms, definitions and surface texture parameters,” JIS B 0601: 2001 (ISO 4287: 1997), pp. 268-274. * cited by examiner U.S. Patent Apr. 16, 2013 Sheet 1 of 3 US 8.420,224 B2 id. :: : &: 3. 8& E. E. 8. U.S. Patent Apr. 16, 2013 Sheet 2 of 3 US 8.420,224 B2 Fig.2B Fig.2C U.S. Patent Apr. 16, 2013 Sheet 3 of 3 US 8.420,224 B2 Fig. 3A ...-88: Si: ;Y. - VAPOR S. i. i. ss. HIN-FILM LAYER - Aig AYE8 STEEL SUBSTRATE ...- :: Si: , ; 8 exoxx re-VAPOR EPOSITED METAL - is THIN-FI. Y: PLAING LAYER - S. 888 Rs. US 8,420,224 B2 1. 2 ZINC-BASED PLATED STEEL, SHEET Electronic equipment up to now have generally secured EXCELLENT IN SURFACE ELECTRICAL this groundability by being screwed to steel housings, chas CONDUCTIVITY HAVING PRIMARY RUST sis, etc. In this case, the end faces of the steel sheet were PREVENTIVE THIN FILMI LAYER exposed at the screw holes, so metal-metal conduction could be easily obtained regardless of any chromate layer. However, This application is a national stage application of Interna along with the increasingly smaller size and higher perfor tional Application No. PCT/JP2008/053108, filed 15 Feb. mance of electronic equipment in recent years, the number of 2008, which is incorporated by reference in its entirety. complicatedly shaped parts has increased, the screw-fastened parts have decreased, and parts have increasingly been joined TECHNICAL FIELD 10 by contact of Steel sheet Surfaces, or contact by caulking or leaf springs. In this case, it is important that the Surface of the The present invention relates to a zinc-based surface plated Steel sheet be small in contact resistance. In systems treated steel sheet used for PCs, audio, TV, and other home coated with insulating resin explained above, the groundabil appliances and copiers, printers, facsimiles, and other office ity therefore became insufficient. automation products which is Superior in the conductivity of 15 As prior art for improving this groundability, JP 2004 the steel sheet Surface, which becomes essential for securing 277876 A forms an intermediate layer having groundability at the groundability and electromagnetic shielding performance the Surface of the plating layer and further forms an organic ofsteel sheet members after assembly of the home electronics resin layer on the surface thereof and specifies that the cov or office automation products, and is also provided with cor erage rate of the organic resin layer is at least 80% and for the rosion resistance. Surface roughness of the steel sheet, an arithmetic average roughness Ra is 1.0 to 2.0 um and a filtered center line wavi BACKGROUND ART ness Wea is not more than 0.8 um. Further, JP 2005-238535A discloses the art of obtaining a For a long time, Surface-treated Steel sheet comprised of Surface roughness of a sheet stock to be plated by defining the galvanized steel sheet treated on its surface by chromate has 25 surface roughness Ra and PPI of electrodischarge treated been used in large quantities for industrial products in a broad temper rolling rolls and securing conductivity of the resultant range of fields. This galvanized steel sheet had a high ability obtained galvanized steel sheet without impairing the corro to suppress the formation of white rust which occurred when sion resistance. used under the usual atmospheric environment and further Furthermore, JP 2002-363766A defines the surface rough had the features of easily securing conductivity between the 30 ness of the sheet stock itself to be plated by the count of peaks electronic board and steel member and having Superior and the Ra So as to achieve both corrosion resistance and groundability and shielding performance. The ability to Sup conductivity. press white rust was high-due to, it was believed, the high However, while JP 2004-277876 A, JP 2005-238535 A, ability of passivation of a chromate film to plated Zinc mate and JP 2002-363766A all demonstrate an effect of improve rial and the high ability of the film of self repair of damages. 35 ment of the conductivity, the performance is not stably Further, the conductivity was good since the chromate treated expressed and depending on the production line, conductivity layer was thin and uniform, so the contact resistance with the cannot be secured. Development of technology stably secur conductive terminals was kept low. ing conductivity has been desired. In recent years, the demands on materials for reduction of Galvanized steel sheet coated with a chromate-free film is environmental load Substances and toxic Substances have 40 produced by Subjecting a coil-shaped steel sheet continuously grown tougher. There is an increasing movement toward to a plating treatment and chromate-free treatment. The plat restricting use of the hexavalent chrome used for chromate ing method includes electroplating and hot dip plating. The films. Hexavalent chrome is a toxic substance identified as former is the art of electrochemically causing the precipita being carcinogenic. Restrictions on discharge of hexavalent tion of Zinc in an aqueous solution containing Znions, while chrome in the process of production of Surface-treated Steel 45 the latter is the art of immersing a steel sheet in a molten state sheet and harm to health accompanying elution thereof at the metal zinc bath to form a film. The surface configuration of time of use of the steel sheet are concerns. the plating is, in the case of electroplating, high in uniformity Therefore, the inventors developed a treated film not using of formation of the plating, so the Surface configuration of the chromate at all (for example, see JP 2000-319787 A). JP sheet stock is maintained, but with hot dip plating, the level 2000-319787. A disclosed the technology of coating the sur 50 ing property is high and configuration is generally imparted face of a galvanized steel sheet with a rust preventive coating by transfer of the configuration of the temper rolling roll after layer. To improve the corrosion resistance, phosphoric acid or plating. The plated steel sheet is coated with a resin-based or an inhibitor ingredient was suitably added. This treated steel inorganic chromate-free film or chromate film, baked, and sheet was Superior in corrosion resistance due to being coated dried by a later post-treatment section. After this, it is coiled with an insulating resin layer, but had the defect of being 55 to obtain the final product. inferior in surface conductivity. Therefore, the rust preventive steel sheet of JP 2000-319787A cannot at present be said to DISCLOSURE OF THE INVENTION have sufficient characteristics for application to home elec tronics, office automation products, and other equipment A Zinc or Zinc alloy plated Steel sheet produced by Such a stressing groundability.
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