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No. 073 2016 2
16
64, 26 33 2015 1)
1
1
ACM
QCM
1 10ng/cm2
pH
ACM pH
pH pH
(JIS ) (ISO )
ACM
QCM
No. 073 2016 2
17
2.1
2.1.1 ACM Atmospheric Corrosion Monitor
ACM 2),3)
Ag
12 ,3
.
2.1.2
Rs
Rp
4)-6)
24) 5) 6)
24 7 3 (CS) WS, NiWS4) (1/Rs, 1/Rp) Rp, Rs
Rs 1/Rs
1 10.80.
020
0.01
5
基板 (炭素鋼)
導電性ペースト絶縁ペースト
(a)
(b)
基板 (炭素鋼)
導電性ペースト (Ag)
銅箔
絶縁ペースト (BN)A A'
A電流計
64
641 ACM
2 (a) (b)
(a) (b)
No. 073 2016 2
18
2.1.3 (Kelvin)
R (M)
ΔφMR
VMR=ΔφMR/e VMR (E)
E= VMR + (1)
E VMR VMR E
3 4 CS WS NiWS Ni
4 MgCl2 10
(a) 0.8mm 0.8mm (b) 5μm 5 μm
No. 073 2016 2
19
8) /
(AFM) (KPFM9)10 ) nm
( 4(b)10))
2.1.4
511
612 13 712
5
7 6 12
6 (a)12) (b) 13)
No. 073 2016 2
20
2.1.5 QCM Quartz Crystal Microbalance
QCM
1
10ng/cm2
14) QCM
RH 15) 8
(Δm/Δt)
Fe+H2O+1/2 O2 Fe(OH)2 (2-1)
Fe+3/2 H2O+3/4 O2 Fe(OH)3 (2-2)
: ΔL/Δt
(ΔL/Δt)=(1/ρFe)(MFe/M(OH)x) (Δm/Δt) (3)
MFe M(OH)x Fe
(OH)x ρFe , ρFe =7.86/gcm3,
2.1.6
h
Δε (R)
Δε= -Δh/2R (4)
(Δh)13)
916
0
2
4
6
8
10
Wei
ght C
hang
e /
10-7
[g/c
m2 ] QCM
Ws=1.1 10-2g/m2
(a)
(b)
0
10
20
30
40
50
60
70
80
RH
(%
)
0 100 200 300 400 500 600 700Time (min)
8 (a)RH(b) QCM
9 (a) (b) 16
(a)(b)
No. 073 2016 2
21
2.1.7
1011
2.2
2.2.1
pH
1mL
pH
pH pH
pH4 1117
2.2.2
(1)
(JIS )
(ISO ) 1
18
(2) QCM
QCM QCM
= +
( 1219))
11 - (b)pH (b)
10
242220181614121086420
( )
pH 1995.05. 254
5
6
7
3
pH
0.27mm
( 300 mm )
(a)
(b)
No. 073 2016 2
22
Airborne sea salt
Cylinder with PbO2 paste
Alkaline filter paper
Sulfur oxide
ISO
JIS
Filter paper immersed inK2CO3 solution
PbO2
Aqueous solution of glycerin
Wet candle
wet gauze
Dry gauze
1 / ISO JIS
Nov. in 1992
Shimizu90
-4
-3
-2
-1
0
1
log
Ws
[g/m
]2
Oct. in 1992
Start
Rain
161514131211109876543213130
Rain Rain
12 QCM
No. 073 2016 2
23
ACM
3.1
3.1.1
ACM
13 ACM (RH) 10
3.1.2
ACM 142)3) ( 15) /
(Ith) Ith=10nA 16μm/y 3.4.1 (7)
3.1.3
ACM (I) RH
16 2 3 RH I
I RH 16
(Ws) 22)3)
13 ACM
No. 073 2016 2
24
14 aACM (b)
(Ith=10nA,CRth=16μm/y)
(2007)
(2003)
(2006)
(2002)
(2002)
(2002)
15 (Tdew)(Tdry) (Train)
0
2
4
6
8
10
12
14
16
Tsukuba
>0.5mm/h<0.5mm/h
rain
rain-affected
rain perioddew dew dew
drydry
(a)
(b)
2
10080604020-4
-3
-2
-1
0
1
2
3
4
RH (%)
log
I [μ
A]
2
1
0
-1
-2
-3
-4
log Ws[g/m ]2
16 ACM (I) RH
210-1-2-3-4
log Ws[g/m2]
( 998)
(1999
No. 073 2016 2
25
3.2
3.2.1
17 ACM (I) RH
17(a) I-RH
17(b)
I-RH
3.2.2
ISO
(TOW) 0℃ 80%
TOW(ISO)=Tdew(ISO)+Train(ISO) (5)
ACM
TOW(ACM)=Tdew(ACM)+Train(ACM) (6)
RH≥80%
Train(ACM)=Train(ISO) TOW(ISO)
TOW(ACM) Tdew(ISO)=Tdew+dry(RH RHth=80%)
Tdew(ACM) 3) 18 1
(dew+dry )
(dew )
I (μ
A)
105
104
103
102
101
100
10-1
10-2
10-3
/
(a)
0 20 40 60 80 100RH (%)
I (μ
A)
105
104
103
102
101
100
10-1
10-2
10-3
(b) (July, 1992) 7/9 12:00 -7/10 12:00 7/10 12:00 -7/11 12:00 7/10 12:00 -7/11 12:00
50 60 70 80 90 100RH (%)
17 I-RH (a) (b)
18 (a) (b) 1(Tdew+dry:○)
(Tdew:●)
RH (%)100806040200
Miyako, 1992.11 - 1993.10Ws=7.4 10 - 2.8 10 g/m-2 -1 2
0
200
400
600
800
1000
1200
Tim
e (h
)
RHth=80%RHc=62%
(b)
dry+dew dew
Ws= 7.4×10-2 – 2.8×10-1 g/m2
1993.1-1993.12
Ws=1.4×10-2-1.1×10-1g/m2
1992.10-1993.10
Ws=7.4×10-2-2.8×10-1g/m2
Tim
e (h
)
No. 073 2016 2
26
ISO RHth=80% Tdew(ACM) ( )
Tdew+dry(RH RHth=80%) ( ) RH 80% 18(a)
Tdew(ACM)= Tdew+dry(RH RHc) RHc RHc=78% RHth=80%
RHc=62% 18(b) ISO RHth 80%
80% 3)
3.3
3.3.1
0.1 40μm20),21) 21)
21) JIS ISO
1
3.3.2
30 40μm21)
2
(α*D) 22) 19 ACM 23) 500m24) 3m (Ws) α*D
Ws>0.1g/m2 Ws α*D Ws-α*D
α*D 4km
Ws 0.3 2g/m2 Ws-α*D
4km Ws
3.4
3.4.1 ACM
QCM ACM
(Q)
log CR [mm/y]= 0.378 log Q [C/day] - 0.636 (7)
-2
-1
0
1
D (107 m2/s/day)0.5 1 1.5 2 2.5 3
ChibaShimizu
log
Ws[
g/m
2 ]
Nishihara(4km)
3m)
log Ws=2.4×10-7α D-5.0log Ws=2.6×10-7α D-2.7
(’97.8-’98.8) (’94.11-’96.11)
(500m)
19(Ws) (α*D)
No. 073 2016 2
27
202 3 Q
ACM (0.1nA)
2μm/y
3.4.2
ACM
2125 ) ACM Zn 3 5μm/y 0.3
0.4μm/y ( 10: 20μm/y) 1/5
26)
3.5 27)
(CR) ACM (Qeff)
( 22)
log CR [mm/y] = 0.682 log Qeff [C/day] - 0.256 (8)
Qeff= Qeff[dew] +Qeff[rain]
= Qdew +0.2Qrain
20 ACM(Q)
Ws=4.5 10-4 g/m2
Ws=1.1 10-2 g/m2
Fe(OH)2Fe(OH)3
Fe(OH)2
Fe(OH)3
QCM
10-1-2-3-4-5-6
-4
-3
-2
-1
0
log Q [C/day]
log
CR
[mm
/y]
'95.10'94.10 '95.10
(1- 12 )
76%
'95.5
85%
log CR=0.378log Q - 0.636
-3
-2
-1
Fe
0-1-2-3-4-5log Ws [g/m2]
-6
-5
-4
-3
-2
-1
0
6 ('95.2)
7 (1y)
部位 4, 6
'95.5 - '96.8部位 1
部位 5
部位 7部位 10
部位 1 部位 5部位 7 部位 10
月ごと ('95.5 - '95.9)
7 ('95.8)
6 (1y)
-4
-3
-2
Zn
log
Q [
C/d
ay]
log
CR
[m
m/y
]
21ACM (Q)
(Ws)
No. 073 2016 2
28
Qrain 0.2Qrain
(CR)
CR 1) (Tdew) CRdew
1 (Td) Q=Qdew(Td/Tdew) (7) 3.4.1
(Ldew) Ldew=CRdewTdew 1
(L) Ldew (ΔL= L – Ldew) Train
23 Train>82h ΔL Train Train<82h
Train>82h (0.061μm/h)
3.6
3.6.1
(RH) 1)
RH 30 50% RH 70% 28)
Cl- 2429
ACM 251)-3)
23 (L)Ldew (ΔL= L–L dew) Train
22(CR)
ACM (Qeff)
log Qeff [C/day]
-2
-1
1
-3
0
log CR=0.682log Qeff -0.256
-2 -1 0-3 21
Qeff = Qeff[dew]+Qeff[rain] = Qdew+ αQrain (α=0.2)
log
CR
[mm
/y]
No. 073 2016 2
29
3.6.2
500m ACM
2 1994 11 1996 1023) Ws 26 ACM
:SW Site1 ’95.4.18
6.22 Ws ’95.4.23 4.24
2.1 2.4g/m2 1996
’95.4.23
37.5m/s(SW)
Ws 1g/m2
2 22Cr-0.8Mo Ws
Ws 0.5g/m2 25
Ws
24 0.1g/m2 MgCl2 304RH
Kelvin
25 RH (%)
log
Ws[
g/m
2 ]
26
240220200180160
Chiba
-5
-4
-3
-2
-1
0
1
2
log
Ws
[g/m
]2
Apr. May Jun. Jul.in 1995
Time (days)
(Site 1) Side A(Site 3)Side B (Site 4)Side B
4.23
7.3
log
Ws [g
/m2 ]
No. 073 2016 2
30
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