Mạ composite ni al2o3 giải pháp kỹ thuật nâng cao khả năng chống mòn của lớp mạ

Nguyen Dang Binh vd cs Tap chi KHOA HOC & CONG NGHE 78(02): 12-16 MA COMPOSITE Ni-A1203 GIAI PHAP KY THUAT NANG CAO KHA NANG CHONG MON CUA L P MA Ni Nguyen Dang Binh, Phan Quang The*, Tran Minh Diic Trirdng Dal hgc Ky thuat Cong nghiep - DH Thdi Nguye TOM TAT Ma composite AI2O3 tren nen Ni la mot giai phap cong nghe be mat de nang cao kha nang chju mai mon cua lop ma Ni lam viec moi truong mdn va an mon cao Ket qua nghien ciiu ma composite AI2O3 tren nen Ni chi rang mat hat AI2O3 tham gia vao lop ma phu thugc dang ke vao phuong phap khuay va toe khuay dung dich huyen phii Do ciing te vi ciia lop ma composite tang khoang 1,8 l§n so voi lop ma Ni thong thuong Mat dong dien qua trinh ma la mot thong so quan trgng anh huong dang ke den chat lugng ciia Idp ma Tu- khoa: Mg composite; Nl-ATO} Ung dung mg composite; Van tdc khudy; Do cimg te vl MCiiDAU Ma dien la mdt phuong phap de tao Idp ma composite Cac hat trung tinh khdng tan dung dich dien phan dugc gifl- lo' lung dung dich va tham gia vao qua trinh hinh va phat trien Idp ma kim loai Viec dua cac hat trung tinh tham gia vao Idp ma composite lam thay ddi dang ke dp ciing, dp ben ciia Idp ma cung nhu lam thay ddi dac tinh tuong tac ciia lop ma vdi be mat ddi tiep hoac mdi trudng xung quanh [1] Qua trinh ma composite, cu the la ma composite AI2O3 tren nen Ni dugc thuc hien be ma dien Ni thdng thudng Dung djch ma dugc dieu che tu cac hda chat bang dung mdi nude eat Cac bat trung tinh dugc giu lo liing dung dich nhd thiet bj khuay theo so' dd nguyen ly tren Hinh Cohat trung tinh thudng dudi 20 pm cho den kich thudc thang nano Chieu day Idp ma cd the dat tu vai pm den vai tram pm [1] Nhdm nghien eiiu da thiet ke, che tao cdng he thdng ma composite tren nen Ni tai trudng Dai hpc Ky thuat Cdng nghiep - Dai hpc Thai Nguyen Cae ket qua nghien ciiu ve qua trinh ma composite AI2O3 tren nen Ni va tinh chat co ly cua Idp ma dugc trinh bay bai bao Hinh So nguyen ly ma composite (a) khuay nhd bom tudi (b) khuay co hpc Tel: 0912064824; Email: phariqthe(iijmit.edu.vn 12 Nguyen Dang Binh vd cs Tap chi KHOA HOC & CONG NGHE 78(02): 12-16 THI NGHIEM Che va qua trinh chuan bj Thiet bj thi nghiem Qua trinh ma dugc thuc bien vdi mat ddng dien 5A/dm" Do pH ciia dung dich khoang tu- + 4,5 (dp pH dugc dieu chinh bang each cho them NHi hoac axit HCl loang); nhiet dp giQ- dn dinh d 40°C ± 2°C; tan sd xung su dung thi nghiem la 200 Hz; ty le xung thuan/ nghich la 80% Thiet bj ma composite tren nen Ni nhdm nghien ciiu tu thiet ke va che tao bao gdm be chua dung djch dien phan dung tich 60 lit, he thdng gia nhiet tu ddng ddng ngat dien cd the nang va dn djnh nhiet dp eiia dung djch tdi 80'^C, he thdng dieu khien tu ddng cung cap ddng mpt chieu xung hoac lien tuc cho be ma, he thdng khuay co hoc ed the dieu chinh vd cap tdc dp khuay tu' 10 v/p den 350 v/p Trudc ma dung dich huyen phii dugc khuay bang may khuay sieu am SW3H ciia Thuy sy 30 phiit, sau dd khuay co' hoc be ina gid Hoa chat Cac hda chat su- dung cho qua trinh ma composite Ni liet ke bang Mau ma composite la thep OOCrSi tdi dat dp Cling HRC = 58-60, dang hinh tru kich thudc d = 26 mm, h = 10 mm dupe danh bdng, sau dd lam sach, riia be hdn hgp axit loang d nhiet mdi trudng trudc ma Trong qua trinh ma, dung djch huyen phu dugc khuay co' hpc dai tdc dp 140, 175, 210, 245 v/p thdi gian 1,5 gid Sau ma, mail dugc nia nude chay, sau dd dugc nia sieu am nude cat khoang 10 phiit Sodium dodecyl sulfate dugc sii- dung la chat phu gia de tang boat tinh be mat cua cae hat trung tinh Hat trung tinh sii- dung tbi nghiem la ALOj vdi ca hat < pm va ham lugng ALOi la 50g/l Cac bat cd kich thudc khdng ddng deu tu vdn ket vdi hat Idn the hien tren anh SEM (Hinh 2) Cac dinh Au tren phan tich EDX la ket qua ciia ma mang Au tren mau hat ALOi Bang Cac loai hoa chat sii dung cho qua trinh ma composite Ni-AliOj Hoa chat NiS0.4.6H,0 (g/1) NiCb.6H,0 (g/1) (g/1) Sodium dodecyl sulfate (g/1) Ham lugng 300 50 40 0,1 % jk H3BO3 ;-oo- X '*• •4,' -^^^i Ensijv (lcs>/) Hinh Anh SEM hat trung tinh AbOi su dung thi nghiem va phAn hoa hgc qua phan tich EDX 13 78(02): 12-16 Tap chi KHOA HOC & CONG NGHE Nguyen Dang Binh vd cs KET QUA THI NGHIEM Chilu day lap ma tren chi tilt tren kinh hiln vi quang hgc dat dugc tir 50pm + 70 pm Mau dugc mai tren giay nhap cd 800, 1000, 1200 sau dd danh bdng tren may danh bdng kim loai hpc ciia Dai Loan bang bdt kim cuong pm sau dd tam thuc dung dich Nital 2% thdi gian phut Dp ciing te vi ciia Idp ma dugc tren ma%' do cung te vi Future fm 700e ciia Nhat, tai trpng 10 gram cho ket qua tren bang Tir kit qua dp ciing t l vi cd the thay rang dp Cling ciia Idp ma composite Ni-ALOj phu thugc vao mat hat AI2O3 va miic dp phan bo dong deu eiia cac hat Idp ma tue la phu thupc vao tdc khuay Vdi tdc dp khuay 140 v/p dp cung te vi ciia Idp ma dat th4p nhat (HV,o=218) Dp ciing t l vi ciia Idp ma composite Ni-ALOs tang den 273 HVio d tdc dp khuay 175 v/p va 210 v/p sau tang din HVio=303kbi tang tdc khuay den 245 v/p g4p 1,78 lan dp cung Idp ma Ni thdng thudng (HV,o=170) tai toe dp khuay 175 v/p Su tham gia ciia cac hat trung tinh ALOj vao lap ma Ni dugc xac djnb tren kinh hien vi dien tu quet (scanning electron microscopy) Jeol 5410 LV tai trudng Dai hpc Khoa hgc Tu nhien Ha Ndi Cd the tha\ rang mat dp cac hat trung tinh AI2O3 tham gia vao Idp ma Ni trd nen ddng deu ho-n tang tdc dp khuay tii' 140 v/p den 245 v/p (hinh 3) Hien tugng vdn cue thudng xa\ rd net d tdc khuay thap Day la bien tupng cac hat ALOj lien ket lai vdi va tao nhirng mang cue bd Idp ma (Hinh 3a) Tai nhiing noi xa\ vdn cue cua cac hat trung tinb dp ciing te \ i giam rd ret Ket qua phan tich EDX be mat ciia cac Idp ma sau kbi dugc mai danh bdng va tam tbirc khang djnh ALO; tham gia vao Idp ma Ni cbi tren Hinh Thanh phan hda hgc be mat chii veu la Ni ALO-, \ a mdt ham luong nhd Fe PHAN TICH KET QUA Co tinh cua lop ma composite phu thudc vac rk nhilu ylu td qua trinh ma dien Tuy nhien, cae thdng sd ve mat dp ddng dien nhiet dp dung djch dien phan va dp pH ndi chung it anh hudng den su tham gia cua cac hat trung tinh vao Idp ma nen dugc giO co djnh nghien ciiu Mat ddng dien ed the la mdt thdng sd dugc khao sat rdng nhat Anh hudng cua mat ddng dien din mat dp cac hat tham gia vao Idp ma cd thi khac Mat dp ddng dien cd anh hudng rk it hoac gan nhu khdng cd anh hudng din so hat bam vao lop ma [2] Trong nghien cuu mat dp tan§ mat ddng dien tir A/dm" tdi A/dm" be mat ciia lap ma bi ran niit \ a pha hiiy nghiem trgng hieu ling miii nhcn qua trinh ma Anh hudng ciia nhiet dp dudng nhu khac ddi vdi cac he ma composite Vdi he Ni-A^Os, anh budng ciia nhiet dp tdi phan tram eac hat tham gia vao Idp ma la khdng dang ke [2] Nhiet dp dung djch thi nghiem dugc giir tuong ddi dn djnh tai 40°C Cae nghien cuu lien quan din anh hudng cua pH cho cac kit qua thong nhat, kbi pH > anh hudng cua pH din mat dp hat cung tham gia vao Idp ma la khdng dang ke, cdn d dudi gia trj sd hat Cling tham gia vao Idp ma giam ddi vdi heNi-Al203[4] Toe dp khuay la thdng so dugc dac biet quan tam bdi vi day la thdng sd cd anh hudng true tilp din miic tham gia eiia cae hat vao lop ma Cac hat trung tinh can den be mat ciia cathode de tham gia vao Idp ma composite nen phai dugc dich chuyen tir ngudn hat tdi cathode Khuay thiic day sir djch chuyen cac bat va tang khuay se lam cho nhieu hat ciing tham gia vao lap ma Tuy nhien, tdc khuay qua cao se giam cac hat tham gia vao Idp ma bdi vi eac hat se bj vang khdi be mat cathode trudc chiing dugc giO lai [2, 3] Bang Do ciing te vi ciia lap ma phu thugc toe khuay 14 Lan Ni Ni-AljOj 140 v/p Ni-AljOj 175 v/p Ni-AljOj 210 v/p Trung binh 154 184 170 170 225 230 200 218 280 260 290 273 280 270 270 273 Ni-ALO, 245 v/p 300 300 310 303 Nguyen Dang Binh vd es %.: t^.r tr 78(02): 12-16 Tap chi KHOA HOC & CONG NGHE ih, %-r^- iS ^ z^-^'^' -n TW'i *' i # ^* * ' • » ' ' ' 5t ''-He' l» ' -.>»»• ,"'f "> # '•*.• , \ ' J ' ^* ô ' !ãã*ã'ã ã ãã ' ã ô * * / * : - ; 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