bab iv hasil pengamatan dan perhitungan.docx
TRANSCRIPT
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