Patent SG-11201406485Q-A (SG)
Title: Method for producing hard disk substrate
Inventor: ISHIDA GEN
IPC: G11B5/84
Filed: 2013-04-02
Abstract: (i2) mwu ft iz s-5 iv x m £ titz s issaj n d9) mm IHMMi _ (43) 2013 ^ 10 ^ 17 0 (17.10.2013) I P O I P C T (10) WO 2013/153993 A1 (51) G1 IB 5/84 (2006.01) (21) (22) (25) (26) 4>§fl(£> s In: G11B 5/73 (2006.01) PCT/JP2013/060096 2013 ^4^ 2 0(02.04.2013) I £ \"7 — 3 2 |Jg Tokyo (30) fiBfefix — £: 4#Jg| 2012-089685 2012 ^ 4 ^ 10 0(10.04.2012) JP (71) tti H A: H ;¥_IPI (TOYO KOHAN CO., LTD.) [JP/JP]; T 1028447 KifvtlW-t H E 0#®! 2 S±fe 1 2 Tokyo (JP). (72) Effl TE(ISHIDAGen); T 7448611 Uj • R 1296 #&© 1 Yamaguchi (JP). ifll (MUKAI Nobuaki); T 7448611 UjPftTt&rfT^H# 12 9 6#±feo) 1 fill fa Yamaguchi (JP). • H |5§ JA (YOSHIDA Takahiro); T 7448611 UjPlftTl&rfTKil# 1 2 9 6#±feo)i Yamaguchi (JP). (74) ft IIA: ¥ ^ 51- (HIRAKI Yusuke et al.); T 1056232 m«fP;SEgg2Tg 5# 1 gg ^U->t^XMOR (JP). (8i) IS ft nj f b): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) *!£H (asrofci^isy > ±T(Dmm(Dfcm% V&tf nlfb): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW), 3- — V T (AM, AZ, BY, KG, KZ, RU, TJ, TM), 3 — • V / ^ (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG). - (&&£ 21 &(3)) (54) Title: METHOD FOR PRODUCING HARD DISK SUBSTRATE (54) : /\— KxV AA HI60IJ2-1 BB J±$Mi]2-1 cc kt$$.M2 — 2 mmftx.mztkzs.m-? -a DD EE m o\ o\ m T-H cn i-H o CJ o & AA Embodiment 2-1 BB Comparative example 2-1 CC Comparative example 2-2 DD Almost no mesh-shaped defects are seen EE Mesh-shaped defects arising at portion thereof FF Mesh-shaped defects arising across wide range (57) Abstract: The problem addressed by the present invention is to obtain hard disk a substrate that can obtain a smooth plating film surface by means of electroless NiP plating, and that does not have worsened acid corrosion resistance. The method for produ­ cing hard a disk substrate includes: a first plating step wherein substrate immersed in a is a first electroless NiP plating bath contain­ ing an additive having leveling effect, forming a at the surface of the substrate an electroless NiP plating film bottom layer having a lower average surface roughness than the surface; and second a plating step wherein the substrate which to the electroless NiP plat­ ing film bottom layer has been formed by means of the first plating step is immersed in second electroless a NiP plating bath, form­ ing an electroless NiP plating film top layer having acid corrosion resistance. From the first plating step until transitioning to the second plating step, contact of the bottom layer to the atmosphere suppressed. is (57) mm-' fn WO 2013/153993 A11 lllll llllllll II llllll III lllll lllll lllll lllll III III III lllll lllll lllll llll lllllll llll llll llll NiP cried; y ¥;#   *f§0J<7)/\— KxV l£> 0)tomfifNiPfeo^;§lcSte$;S;SLTl^Stea)a®lc, l CD#)o ^XfMIc J; luIBtom® y Nip ft o £j£M<Z)TJi^BJ$£ *lfcS*J5£, II 2 NiP ft o £;§ lc;S;SLTliB^tt^^-r-S^mfifNiPfeo^SMa)±Ji^BJS-r-Sll2a)feo^XfM<!:^#^ > Hi 0) isb-iZJLmfribBzcDisb-DZJLm^Wiit&^vcDm, TJia)^m^a)gM^WfiJ-r-So