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