Ibrief introduction
Water sol ubl e pre fl uxEN-oneone0#OSP(Organic Sol derabil ity Preserzatl ve有機預焊)工藝是以化學of方法,在裸銅表面形成一層薄膜。這層膜具有防氧化,耐熱沖擊,耐濕性。因而,在PCB制造業中,OSP工藝可替代熱風整平技術。OSP工藝生產ofPCB板具有更優良of平整度和翹曲度,更適應電子工業中SMT技術of發展要求。OSP技術正得到迅速of發展。國內of公司對OSP藥水of研究也take得了很大of進展。我公司ofEN-oneone0#The antioxidant manufacturing process is based on the introduction of advanced Japanese technol ogy, and the cost is greatl y reduced after the l ocal ization of raw material sThe best choice for PCB manufacturers.
two、 Process fl ow and operating conditions
one、工藝流程
DegreasingEN-oneonethree#--→ secondary washing--→Micro erosionEN-oneonetwo#--→ secondary washing--→ pickl ing--→ Di washing--→EN-oneone0#Fil m forming--→ air drying--→ Di washing--→ drying
two. Operating conditions
optimum
Range
concentration
one00%
90—oneone0%
temperature
three0℃
twofive—threefive℃
Immersion time
six0sec
three0—90sec
PH
three.three
three.0—three.six
fil ter
連續fil ter,循環量three—4次/小時
Fil m thickness
0.twofive—0.threefive μM
0.two—0.five μM
三、Fil m forming厚度ofcontrol
OSP of關鍵是control 好防氧化膜of厚度。膜太薄,耐熱沖擊能力差,在過回流焊時膜層耐不住高溫(one90-000C),最終影響焊接性能;膜太厚,在電子裝配線上,膜不能很好of被助焊劑所溶解,影響焊接性能。一般control Fil m thickness在0.two-0.fiveμMIt is more suitabl e between.
要得到均勻穩定ofFil m thickness,生產中應control 好以下幾方面of參數:
one、Degreasing
Degreasing效果of好壞直接影響到Fil m forming質量。Degreasing不良,則Fil m forming厚度不均勻。一方面,可以通過分析溶液,將concentrationcontrol 在工藝Range內,另一方面,也要經常檢查Degreasing效果是否好,如Degreasing效果不好,則應及時更換Degreasing液。
two、Micro erosion
Micro erosionof目of是形成粗糙of銅面,便于Fil m forming。Micro erosionof厚度直接影響到Fil m forming速率,因此,要形成穩定ofFil m thickness,保持Micro erosion厚度of穩定是非常重要of。一般將Micro erosion厚度control 在one0-one.fiveμMMore appropriate.
每班生產前,可測定Micro erosion速率,根據Micro erosion速率來確定Micro erosion時間。
three、Fil m forming
a、Working fl uidof有效物concentration對Fil m forming速率有一定影響,盡量control Working fl uidof有效物concentration穩定是重要of。
b、control Stabil ity of pH val ue (PH)three.two-three.five)。PH值of變化對Fil m forming速率影響較大。PH值越高,Fil m forming速率越快;反之,PH值越低,則Fil m forming速率越慢。
c、control Fil m forming液temperatureof穩定也是必要of。因為Fil m forming液temperatureof變化對Fil m forming速率影響比較大,temperature越高,Fil m forming速率越快。
d、Fil m forming時間ofcontrol 。Fil m forming時間越長,Fil m forming厚度越大。根據實測ofFil m thickness來確定Fil m forming時間。
4、Fil m forming前of水洗最好采useDI水,以防Fil m forming液遭到污染。
five、Fil m forming后of水洗最好采useDI水,且PH值應control 在five0-seven0To prevent the fil m from being pol l uted and damaged.
4、 Detection method
one、Degreasing效果檢測方法
一般認為,經Degreasing后,板面裸銅面在水洗后能形成水膜且在onefive秒鐘內不破裂,說明Degreasing效果良好。否則,可考慮補充或更換Degreasing劑。
two、Micro erosion速率測定方法
a、takesevencm×sevencmofone.sixmm Thick doubl e-sided copper foil pl ate with an area ofS(cmtwo);
b、Put it in the oven and90-one00OC烘three0分鐘;
c、Cool it to room temperature in a moisture-proof bottl e and weigh it with an anal ytical bal anceWone(g);
d、隨生產板浸入生產線內ofDegreasing缸中,并于Micro erosion缸后take出(保證浸蝕時間跟生產板一致),Micro erosion時間記為t(minutes);
e、After washing with water, put it in the oven90-one00OC烘three0分鐘;
f、Cool it to room temperature in a moisture-proof bottl e and weigh it with an anal ytical bal anceWtwo(g);
g、cal cul ation
Copper etching rate (μ m)/分鐘)=one0000×(Wone-Wtwo)/(8.9two×two×S×t)
three、Fil m forming液有效物concentrationof測定方法
a、EN-oneone0#Stock sol utiontwo0ml ,use去離子水稀釋至five00ml ,混勻。此為標準液。
b、Working fl uidtwo0ml ,use去離子水稀釋至five00ml ,混勻。
c、In UV spectrophotometer, attwosevensixnmUse deionized water as reference and cal ibrate zero.
d、Adjust the absorbance with standard sol ution toone00,再測Working fl uidof吸光度A。
e、cal cul ation
有效物concentration(%)=A
4、Fil m forming厚度測試方法
a、Put a piecefortymm×five0mmof單面裸銅板與生產板一起在OSP production l ine processing;
b、將已處理of板放在一干凈oftwofive0mL in beaker;
c、use移液管takefive0ml five%of鹽酸液,放入燒杯,輕搖燒杯,三分鐘后將板拿出;
d、usefive%of鹽酸校零,在紫外分光光度計上,于twosevensixnmMeasure absorbance at;
e、Againc步驟準備of液體更換,讀take在twosevensixnm處of吸光度A;
f、cal cul ation:
Fil m thickness(微米)0.seven× A
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