20080701-287-電化學加工技術介紹與應用
TRANSCRIPT
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CAD/CAMCAD/CAM
( )
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CAD/CAMCAD/CAM
Pourbaix diagram
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I-V cure
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CAD/CAMCAD/CAM
Pourbaix diagram( )
Pourbaix Diagram -PH
PH
Pourbaix Diagram
Nernst
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Pourbaix diagram( )
Pourbaix Nernst
Cr(OH)3
Cr
Cr3
Cr2+
CrO42-
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I=if-ib
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IL
IL=DnFCB/X
D CB
X
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CAD/CAMCAD/CAM
(
)
Nernst
ii
i
ZF
RT
L
L
e
= log303.2
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CAD/CAMCAD/CAM
( )
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CAD/CAMCAD/CAM
: ( passivestate )
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(Metal modification theory)
(Reaction velocity theory)
(Oxide film theory)
(Adsorption electrochemical theory)
( (Diffusiontheory)
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CAD/CAMCAD/CAM
PH
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CAD/CAMCAD/CAM
I-V Curve
AB etchingarea CD
polishing area DE pitting area
cd
( v )
a
bc d
e
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FeFe2++2e-
2H2O+2e-H2+2OH
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2Fe+4H2O+O22Fe(OH)3
+ H2
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5~10
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ECM EDM
0.05mm 0.01mm
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iVe =
Ve mm/min
mm3/A.min
K
V
V
( )Ve
EVK =
ECM
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ECM
a.
b.
c.
a. NaCl
b. NaNO3 NaCl
c. NaClO3
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McGeough 1988
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900cm2
10000A 0-30V
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CAD/CAMCAD/CAM
(ECMP)
( )
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CAD/CAMCAD/CAM
( )
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CAD/CAMCAD/CAM
( )
Ra
0.01m
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( )
+ -
+
+ eFeFe 22
+
+ OHHeOH 22
22
2
++ 22)(22 HOHFeOHFe
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C
N
C
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CNC milling
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CAD/CAMCAD/CAM
( )
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( )
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CAD/CAMCAD/CAM
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(Fc30)
(Ra=0.05m)
60%
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Ra=0.38 m
Ra=0.02 m
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Ra 0.86 m0.23 m
CAD/CAM
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CAD/CAMCAD/CAM
(EP)
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CAD/CAMCAD/CAM
( )
(Ra Rmax)
EP
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( )
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The principle of electropolishing
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Electropolishing Mechanism(
)
Ben Franklin EP
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Electropolishing Mechanism(
)
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Electropolishing Mechanism(
)
The metal irons insolution at the edge of
the anode film willnaturally migrate intothe main body of thesolution.
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CAD/CAMCAD/CAM
(a)
(b)
(c)
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EP
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CAD/CAMCAD/CAM
( )
Rmax
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CAD/CAMCAD/CAM
( )
ESCA
SEM
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EP
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