BAB IV
HASIL PENGAMATAN DAN PERHITUNGAN
4.1. Hasil Pengamatan
Tabel 4.1.1. Korosi Logam pada Larutan NaOH, HCL dan Aquadest
No Jenis Bahan LarutanBerat Awal
(gram)
Berat Akhir
(gram)
WI
(gram)
1 Paku Besi + Baterai
NaOH
4,4707 4,4528 0,0179
2 Paku Besi 4,6454 4,4578 0,1876
3 Paku Besi + Seng 5,7147 5,4032 0,3115
4 Paku Besi + Baterai
HCL
4,4727 1,8144 2,6583
5 Paku Besi 4,3878 1,3665 3,0213
6 Paku Besi + Seng 5,9274 2,2279 3,6995
7 Paku Besi + BateraiAquades
t
4,3837 4,3743 0,0094
8 Paku Besi 4,4614 4,4584 0,003
9 Paku Besi + Seng 5,5248 5,5131 0,0117
4.2. Perhitungan
WI = Wa
– Wai
vcorr =
WIA ⋅ t
Keterangan:
vcorr = Laju Korosi (g m-2day-1) atau (g cm-2h-1)
WI = Selisih berat (gr)
Wa = Berat awal (gr)
Wai = Berat akhir (g)
A = Luas permukaan logam (cm2)
17
18
t = waktu (h)
Diketahui :
A paku = 2 × π × r × t
= 2 ×3,14 × 1,1 cm × 5,7 cm
= 39,375 cm2
= 3,9375 × 10-3 m2
A seng = s × s
= 3 × 3
= 9 cm2
= 9 × 10 -4 m2
A seng + A paku = (3,9375 × 10-3 + 9 ×10 -4) m2
= 4,8375 × 10-3 m2
t = 3 hari = 72 jam
4.2.1. Perhitungan Laju Korosi Logam pada Larutan NaOH
1) Paku Besi + Baterai
Vcorr =
WIA ⋅ t
Vcorr = 0,0179 g r
(3,9375 × 10-3 ) m2 × (72 jam)
= 0,0631 gr m-2 jam-1
2) Paku Besi
Vcorr =
WIA ⋅ t
Vcorr = 0,1876 g r
(3,9375 × 10-3 ) m2 × (72 jam)
= 0,6617 gr m-2 jam-1
3) Paku Besi + Seng
Vcorr =
WIA ⋅ t
Vcorr = 0,3115 g r
(4,8375 × 10-3 ) m 2 × (72 jam)
19
= 0,8943 gr m-2 jam-1
4.2.2. Perhitungan Laju Korosi Logam pada Larutan HCL
1) Paku Besi + Baterai
Vcorr =
WIA ⋅ t
Vcorr = 2,6583 g r
(3,9375 × 10-3 ) m2 × (72 jam)
= 9,3767 gr m-2 jam-1
2) Paku Besi
Vcorr =
WIA ⋅ t
Vcorr = 3,0213 g r
(3,9 375 × 10 -3 ) m2 × (72 jam)
= 10,6571 gr m-2 jam-1
3) Paku Besi + Seng
Vcorr =
WIA ⋅ t
Vcorr = 3,6995 g r
(4 ,8 375 × 10-3 ) m2 × (72 jam)
= 10,6215 gr m-2 jam-1
4.2.3. Perhitungan Laju Korosi Logam pada Larutan Aquadest
1) Paku Besi + Baterai
20
Vcorr =
WIA ⋅ t
Vcorr = 0,0094 g r
(3 , 9375 × 10 -3 ) m2 × (72 jam)
= 0,0332 gr m-2 jam-1
2) Paku Besi
Vcorr =
WIA ⋅ t
Vcorr = 0,003 g r
(3 , 9375 × 10 -3 ) m2 × (72 jam)
= 0,0105 gr m-2 jam-1
3) Paku Besi + Seng
Vcorr =
WIA ⋅ t
Vcorr = 0,0117 g r
(4,8 375 × 10-3 ) m2 × (72 jam)
= 0,0336 gr m-2 jam-1
4.2.4. Tabel Hasil Perhitungan dan Grafik
Tabel 4.2.1. Hasil Vcorr dan WI Terhadap Larutan NaOH, HCL, dan Aquadest
No Jenis Bahan LarutanVcorr
(gr m-2jam-1)
WI
(gram)
1 Paku Besi + BateraiNaOH
0,0631 0,0179
2 Paku Besi 0,6617 0,1876
21
3 Paku Besi + Seng 0,8943 0,3115
4 Paku Besi + Baterai
HCL
9,3767 2,6583
5 Paku Besi 10,6571 3,0213
6 Paku Besi + Seng 10,6215 3,6995
7 Paku Besi + Baterai
Aquadest
0,0332 0,0094
8 Paku Besi 0,0105 0,003
9 Paku Besi + Seng 0,0336 0,0117
Ini grafik arsip yulianto, men nak buat kek ini ye buatnyo
Grafik 4.2.1. Grafik Hubungan antara W1 pada Larutan NaOH dan Vcorr
Paku Besi + Bat-erai
Paku Besi Paku Besi + Seng
NaOH 66.3481953290874
132.696390658174
90.7111756168359
1030507090
110130
Chart Title
V Corr
22
Grafik 4.2.2. Grafik Hubungan antara W1 pada Larutan HCL dan Vcorr
Grafik 4.2.3. Grafik Hubungan antara W1 pada Larutan Aquadest dan Vcorr
Paku Besi + Baterai Paku Besi Paku Besi + Seng
HCl 1127.91932059448 1326.96390658174 514.029995162071
100
300
500
700
900
1100
1300HCl
V Corr
Paku Besi + Baterai Paku Besi Paku Besi + Seng
Aquadest 199.044585987261
132.696390658174
332.607643928399
25
75
125
175
225
275
325
Aquadest
V Corr
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