JP5697641B2 - SnおよびSn合金に対する表面処理剤 - Google Patents
SnおよびSn合金に対する表面処理剤 Download PDFInfo
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- JP5697641B2 JP5697641B2 JP2012224710A JP2012224710A JP5697641B2 JP 5697641 B2 JP5697641 B2 JP 5697641B2 JP 2012224710 A JP2012224710 A JP 2012224710A JP 2012224710 A JP2012224710 A JP 2012224710A JP 5697641 B2 JP5697641 B2 JP 5697641B2
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- 229910001128 Sn alloy Inorganic materials 0.000 title claims description 36
- 239000012756 surface treatment agent Substances 0.000 title claims description 24
- 229910052718 tin Inorganic materials 0.000 title claims description 19
- 229910000679 solder Inorganic materials 0.000 claims description 79
- 239000000843 powder Substances 0.000 claims description 22
- 238000004381 surface treatment Methods 0.000 claims description 21
- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 claims description 18
- 239000001263 FEMA 3042 Substances 0.000 claims description 18
- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 claims description 18
- 235000015523 tannic acid Nutrition 0.000 claims description 18
- 229920002258 tannic acid Polymers 0.000 claims description 18
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 claims description 18
- 229940033123 tannic acid Drugs 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- 239000003963 antioxidant agent Substances 0.000 claims description 10
- 230000003078 antioxidant effect Effects 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000004020 conductor Substances 0.000 claims description 5
- 239000003125 aqueous solvent Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000000758 substrate Substances 0.000 description 21
- 238000007747 plating Methods 0.000 description 20
- 238000007254 oxidation reaction Methods 0.000 description 17
- 230000003647 oxidation Effects 0.000 description 16
- 239000000956 alloy Substances 0.000 description 15
- 239000000243 solution Substances 0.000 description 15
- 229910045601 alloy Inorganic materials 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 14
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- 229910020994 Sn-Zn Inorganic materials 0.000 description 11
- 229910009069 Sn—Zn Inorganic materials 0.000 description 11
- 229920001864 tannin Polymers 0.000 description 11
- 239000001648 tannin Substances 0.000 description 11
- 235000018553 tannin Nutrition 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 238000003860 storage Methods 0.000 description 10
- 235000006708 antioxidants Nutrition 0.000 description 9
- 230000004907 flux Effects 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000010949 copper Substances 0.000 description 8
- 239000002253 acid Substances 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910020816 Sn Pb Inorganic materials 0.000 description 5
- 229910020922 Sn-Pb Inorganic materials 0.000 description 5
- 229910008783 Sn—Pb Inorganic materials 0.000 description 5
- 239000012190 activator Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000007654 immersion Methods 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000005476 soldering Methods 0.000 description 4
- 239000013008 thixotropic agent Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 239000004480 active ingredient Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 description 2
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- 229910020836 Sn-Ag Inorganic materials 0.000 description 2
- 229910020830 Sn-Bi Inorganic materials 0.000 description 2
- 229910020988 Sn—Ag Inorganic materials 0.000 description 2
- 229910018728 Sn—Bi Inorganic materials 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- -1 phosphate ester Chemical class 0.000 description 2
- 150000008301 phosphite esters Chemical class 0.000 description 2
- 150000003014 phosphoric acid esters Chemical class 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- CSTRPYAGFNTOEQ-MGMRMFRLSA-N (2r)-2-[(1s)-1,2-dihydroxyethyl]-3,4-dihydroxy-2h-furan-5-one;octadecanoic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O.CCCCCCCCCCCCCCCCCC(O)=O CSTRPYAGFNTOEQ-MGMRMFRLSA-N 0.000 description 1
- SPSPIUSUWPLVKD-UHFFFAOYSA-N 2,3-dibutyl-6-methylphenol Chemical compound CCCCC1=CC=C(C)C(O)=C1CCCC SPSPIUSUWPLVKD-UHFFFAOYSA-N 0.000 description 1
- FARHYDJOXLCMRP-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-1-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]pyrazol-3-yl]oxyacetic acid Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C=1C(=NN(C=1)CC(N1CC2=C(CC1)NN=N2)=O)OCC(=O)O FARHYDJOXLCMRP-UHFFFAOYSA-N 0.000 description 1
- CIWBSHSKHKDKBQ-DUZGATOHSA-N D-araboascorbic acid Natural products OC[C@@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-DUZGATOHSA-N 0.000 description 1
- 239000011627 DL-alpha-tocopherol Substances 0.000 description 1
- 235000001815 DL-alpha-tocopherol Nutrition 0.000 description 1
- ASMQGLCHMVWBQR-UHFFFAOYSA-N Diphenyl phosphate Chemical compound C=1C=CC=CC=1OP(=O)(O)OC1=CC=CC=C1 ASMQGLCHMVWBQR-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 239000002310 Isopropyl citrate Substances 0.000 description 1
- 239000002211 L-ascorbic acid Substances 0.000 description 1
- 235000000069 L-ascorbic acid Nutrition 0.000 description 1
- 150000000996 L-ascorbic acids Chemical class 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- 241000208225 Rhus Species 0.000 description 1
- 235000014220 Rhus chinensis Nutrition 0.000 description 1
- 235000004443 Ricinus communis Nutrition 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- VLSOAXRVHARBEQ-UHFFFAOYSA-N [4-fluoro-2-(hydroxymethyl)phenyl]methanol Chemical compound OCC1=CC=C(F)C=C1CO VLSOAXRVHARBEQ-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- SWLVFNYSXGMGBS-UHFFFAOYSA-N ammonium bromide Chemical compound [NH4+].[Br-] SWLVFNYSXGMGBS-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- CZBZUDVBLSSABA-UHFFFAOYSA-N butylated hydroxyanisole Chemical compound COC1=CC=C(O)C(C(C)(C)C)=C1.COC1=CC=C(O)C=C1C(C)(C)C CZBZUDVBLSSABA-UHFFFAOYSA-N 0.000 description 1
- 235000010354 butylated hydroxytoluene Nutrition 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229920002770 condensed tannin Polymers 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- YPHMISFOHDHNIV-FSZOTQKASA-N cycloheximide Chemical compound C1[C@@H](C)C[C@H](C)C(=O)[C@@H]1[C@H](O)CC1CC(=O)NC(=O)C1 YPHMISFOHDHNIV-FSZOTQKASA-N 0.000 description 1
- GVJHHUAWPYXKBD-UHFFFAOYSA-N d-alpha-tocopherol Natural products OC1=C(C)C(C)=C2OC(CCCC(C)CCCC(C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-UHFFFAOYSA-N 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 235000010350 erythorbic acid Nutrition 0.000 description 1
- 239000004318 erythorbic acid Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229940074391 gallic acid Drugs 0.000 description 1
- 235000004515 gallic acid Nutrition 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001461 hydrolysable tannin Polymers 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229940026239 isoascorbic acid Drugs 0.000 description 1
- SKHXHUZZFVMERR-UHFFFAOYSA-L isopropyl citrate Chemical compound CC(C)OC(=O)CC(O)(C([O-])=O)CC([O-])=O SKHXHUZZFVMERR-UHFFFAOYSA-L 0.000 description 1
- 235000019300 isopropyl citrate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- CDXVUROVRIFQMV-UHFFFAOYSA-N oxo(diphenoxy)phosphanium Chemical compound C=1C=CC=CC=1O[P+](=O)OC1=CC=CC=C1 CDXVUROVRIFQMV-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 239000006179 pH buffering agent Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- ABLZXFCXXLZCGV-UHFFFAOYSA-N phosphonic acid group Chemical group P(O)(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 235000013824 polyphenols Nutrition 0.000 description 1
- RWPGFSMJFRPDDP-UHFFFAOYSA-L potassium metabisulfite Chemical compound [K+].[K+].[O-]S(=O)S([O-])(=O)=O RWPGFSMJFRPDDP-UHFFFAOYSA-L 0.000 description 1
- 235000010263 potassium metabisulphite Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 1
- 239000004320 sodium erythorbate Substances 0.000 description 1
- 235000010352 sodium erythorbate Nutrition 0.000 description 1
- 235000010262 sodium metabisulphite Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- RBWSWDPRDBEWCR-RKJRWTFHSA-N sodium;(2r)-2-[(2r)-3,4-dihydroxy-5-oxo-2h-furan-2-yl]-2-hydroxyethanolate Chemical compound [Na+].[O-]C[C@@H](O)[C@H]1OC(=O)C(O)=C1O RBWSWDPRDBEWCR-RKJRWTFHSA-N 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 235000010269 sulphur dioxide Nutrition 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- 229960000984 tocofersolan Drugs 0.000 description 1
- 125000004417 unsaturated alkyl group Chemical group 0.000 description 1
- GVJHHUAWPYXKBD-IEOSBIPESA-N α-tocopherol Chemical compound OC1=C(C)C(C)=C2O[C@@](CCC[C@H](C)CCC[C@H](C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-IEOSBIPESA-N 0.000 description 1
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- Electroplating Methods And Accessories (AREA)
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Description
(1) 接続端子部の導体表面にSnまたはSn合金めっきを施した電子部品、はんだボール、はんだ粉末からなる群から選ばれるSn及びSn合金表面に被膜を形成する表面処理を行うための、タンニン酸を0.01g/L以上含むみ、水系溶媒を用い、溶液のpHを3〜5に調整したことを特徴とする表面処理剤。
(2) 更に酸化防止剤を含むことを特徴とする前記(1)に記載の表面処理剤。
(3) 前記(1)〜(2)のいずれかに記載の表面処理剤による表面処理方法。
(4) 前記(3)に記載の表面処理方法により表面処理を行ったSn合金はんだボール、又ははんだ粉末。
(5) 前記(4)に記載のSn合金はんだボールを電気的接続部材として用いたことを特徴とするボールグリッドアレイ。
(6) 前記(4)に記載のSn合金はんだボールを電子部品に配置し、これを回路基板に接続したことを特徴とする実装品。
(7) 前記(4)に記載のSn合金はんだ粉末を用いたことを特徴とするはんだペースト。
(8) 前記(7)に記載のはんだペーストを用いたことを特徴とする実装品。
1)フェノール性水酸基を分子内に持つdl−α−トコフェロール、ジブチルヒドロキシトルエン、ブチルヒドロキシアニソール、没食子酸などと、L−アスコルビン酸、L−アスコルビン酸ステアリン酸エステル等のアスコルビン酸誘導体、エリソルビン酸、エリソルビン酸ナトリウム、L−システイン塩酸塩などのラジカルや活性酸素を消去するもの、
2)ピロ亜硫酸カリウム、ピロ亜硫酸ナトリウム、亜硫酸ナトリウム、次亜硫酸ナトリウム、二酸化硫黄などの無機系還元作用が強いもの、
3)エチレンジアミン四酢酸カルシウム二ナトリウム、エチレンジアミン四酢酸二ナトリウム、クエン酸イソプロピルなどのキレート作用が強いもの
がある。
参考例1〜2、実施例3〜7、及び比較例1
タンニン酸(タンニン酸AL、富士化学工業(株)製)を主成分とするイソプロピルアルコール(IPA)溶液又は水溶液を7種類調製した(参考例1〜2、実施例3〜7)。内訳を表1に示す。
この基材に対し、膜厚約5μmのSnめっきを行った(めっき浴:ティンコートK(日鉱メタルプレーティング(株)製)、めっき条件:陰極電流密度2A/dm2、温度20℃、液流動及びカソード揺動めっき)。
耐熱酸化性
これらの試験基板を、220℃に保持した電気炉において、大気雰囲気で1時間熱処理した後、鉛フリーはんだとのはんだ付け性(ゼロクロスタイム)をメニスコグラフ法で以下の測定条件に基づき測定し、下記の基準に沿って評価した。
はんだ槽;すず:銀:銅=96.5:3:0.5(浴温245℃)
フラックス;NA−200(タムラ化研製)
浸漬深さ;2mm
浸漬速度;4mm/sec.
浸漬時間;5sec.
評価基準
◎: ゼロクロスタイム1秒未満
○: ゼロクロスタイム1秒以上3秒未満
△: ゼロクロスタイム3秒以上5秒未満
×: ゼロクロスタイム5秒以上
表1に試験結果を示す。
耐湿酸化性
これらの試験基板に対し、PCT処理(温度105℃、湿度100%の密閉釜内にて16時間放置)を施した後、鉛フリーはんだとのはんだ付け性(ゼロクロスタイム)をメニスコグラフ法で耐熱酸化性の項と同様に測定し、評価した。表1に試験結果を示す。
溶液の安定性
参考例1〜2、実施例3〜7で調製した溶液をネジ口ビンに入れ、蓋を閉めて、40℃に保持したウォーターバスに浸漬して、溶液の経時劣化(沈殿の発生)を確認した。結果を併せて表1に示す。
前記参考例1〜2、実施例3〜7と同様な前処理を行った銅材(C1020P、10mm×25mm×0.2tmm)に対し、膜厚約5μmのSn−Znめっきを行った(めっき浴:日鉱メタルプレーティング(株)製、めっき条件:陰極電流密度3A/dm2、温度35℃、pH4.0、液流動及びカソード揺動めっき)。
参考例14では、Snめっきに対し表面処理したもののウィスカー発生が、表面処理しなかったものと比べて、著しく抑制された結果を示す。
参考例15、及び比較例4
参考例15では、表面処理したSn−9%Zn合金粉を用いたペーストの保存安定性が、表面処理しなかったものと比べて、著しく抑制された結果を示す。
参考例16、及び比較例5
参考例16では、表面処理したSn−3%Ag−0.5%Cu合金微粉を用いたペーストの保存安定性が、表面処理しなかったものと比べて、著しく抑制された結果を示す。
参考例17、及び比較例6
参考例17では、表面処理したSn−3%Ag−0.5%Cu合金を用いたはんだボールの耐酸化性能が、表面処理しなかったものと比べて、著しく改善された結果を示す。
フラックス:NA−200、タムラ化研製
それぞれのはんだ部を上方から写真撮影し、はんだ部の濡れ広がり面積を算出し、はんだボールの濡れ広がり性を評価した。表3に結果を示す。
Claims (8)
- 接続端子部の導体表面にSnまたはSn合金めっきを施した電子部品、はんだボール、はんだ粉末からなる群から選ばれるSn及びSn合金表面に被膜を形成する表面処理を行うための、タンニン酸を0.01g/L以上含み、水系溶媒を用い、溶液のpHを3〜5に調整したことを特徴とする表面処理剤。
- 更に酸化防止剤を含むことを特徴とする請求項1に記載の表面処理剤。
- 請求項1〜2のいずれかに記載の表面処理剤による表面処理方法。
- 請求項3に記載の表面処理方法により表面処理を行ったSn合金はんだボール、又ははんだ粉末。
- 請求項4記載のSn合金はんだボールを電気的接続部材として用いたことを特徴とするボールグリッドアレイ。
- 請求項4に記載のSn合金はんだボールを電子部品に配置し、これを回路基板に接続したことを特徴とする実装品。
- 請求項4に記載のSn合金はんだ粉末を用いたことを特徴とするはんだペースト。
- 請求項7に記載のはんだペーストを用いたことを特徴とする実装品。
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