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BAB 44.1. Data PengamatanTabel . Pengamatan Visual Objek PraktikumLarutanAwalSetelah 8 Hari
NaCl
HCl
Air Kran
Tabel.. Data Pengukuran Potensial Logam dan Sel (V/CSE), Luas, dan Berat Logam
LarutanLogamE0 logam (V/CSE)Luas (cm2)E0 sel (V/CSE)Berat (gram)
AwalAkhirAwalAkhir
NaClFe-0.3696.84-0.986-0.722-10.3310.25
Zn-1.0237.81.661.6
Fe-0.4047.22-0.893-0.73310.5410.45
Cu-0.0999.611.5811.53
HCLFe-0.5067.2-0.506-0.53710.5110.21
Zn-0.61571.531.33
Fe-0.5139.24-0.478-0.34810.149.85
Cu-0.2747.410.2110.16
Air kranFe-0.3057.6-0.568-0.7410.3210.24
Zn-0.3138.191.051
Fe-0.3617.4-0.066-0.19510.4110.31
Cu-0.0478.148.788.75
4.2. Hasil Pengolahan DataKonversi satuan E logam dan E sel (V/CSE menjadi V/SCE)
Tabel . Data Pengukuran Potensial Logam dan Sel (V/SCE), Luas, dan Berat LogamLarutanLogamE0 logam (V/SCE)Luas (cm2)E0 sel (V/SCE)Berat (gram)
AwalAkhirAwalAkhir
NaClFe-0.2926.84-0.909
-0.645
10.3310.25
Zn-0.9467.81.661.60
Fe-0.3277.22-0.816
-0.656
10.5410.45
Cu-0.0229.611.5811.53
HCLFe-0.4297.2-0.429
-0.46
10.5110.21
Zn-0.53871.531.33
Fe-0.4369.24-0.401
-0.271
10.149.85
Cu-0.1977.410.2110.16
Air kranFe-0.2287.6-0.491
-0.663
10.3210.24
Zn-0.2368.191.051
Fe-0.2847.40.011
-0.118
10.4110.31
Cu0.038.148.788.75
Menghitung laju korosi masing masing logamr = keterangan:r = laju korosi (mpy)m = massa logam yang hilang (gr)A = luas permukaan logam (cm2)t= waktu (jam) = densitas logam (gr/cm3)
LarutanLogamA (cm2)m (gr) (gr/cm3)Waktu (jam)laju korosi (mpy)
NaClFe6.840.087.91924.195 x 10-07
Zn7.80.067.141923.052 x 10-07
Fe7.220.097.91924.471 x 10-07
Cu9.60.058.91921.658 x 10-07
HCLFe7.20.37.91921.494 x 10-06
Zn70.27.141921.134 x 10-06
Fe9.240.297.91921.126 x 10-06
Cu7.40.058.91922.151 x 10-07
Air kranFe7.60.087.91923.775 x 10-07
Zn8.190.057.141922.423 x 10-07
Fe7.40.17.91924.847 x 10-07
Cu8.140.038.91921.173 x 10-07
LAMPIRAN
Konversi satuan E logam dan E sel (V/CSE menjadi V/SCE)
E0 logam (V/SCE)
NaClFe= -0.369 + (0.318-0.241)= -0.292 V/SCE
Zn= -1.023 + (0.318-0.241)= -0.946 V/SCE
Fe= -0.404 + (0.318-0.241)= -0.327 V/SCE
Cu= -0.099 + (0.318-0.241)= -0.022 V/SCE
HCLFe= -0.506 + (0.318-0.241)= -0.429 V/SCE
Zn= -0.615 + (0.318-0.241)= -0.538 V/SCE
Fe= -0.513 + (0.318-0.241)= -0.436 V/SCE
Cu= -0.274 + (0.318-0.241)= -0.197 V/SCE
Air kranFe= -0.305 + (0.318-0.241)= -0.228 V/SCE
Zn= -0.313 + (0.318-0.241)= -0.236 V/SCE
Fe= -0.361 + (0.318-0.241)= -0.284 V/SCE
Cu= -0.047 + (0.318-0.241)= 0.03 V/SCE
E0 sel awal (V/SCE)
NaClFe Zn= -0.986 + (0.318-0.241)= -0.909 (V/SCE)
Fe Cu= -0.893 + (0.318-0.241)= -0.816 (V/SCE)
HClFe Zn= -0.506 + (0.318-0.241)= -0.429 (V/SCE)
Fe Cu= -0.478 + (0.318-0.241)= -0.401 (V/SCE)
Air KranFe Zn= -0.568 + (0.318-0.241)= -0.491 (V/SCE)
Fe Cu= -0.066 + (0.318-0.241)= 0.011 (V/SCE)
E0 sel akhir (V/SCE)
NaClFe Zn= -0.722 + (0.318-0.241)= -0.645 (V/SCE)
Fe Cu= -0.733 + (0.318-0.241)= -0.656 (V/SCE)
HClFe Zn= -0.537 + (0.318-0.241)= -0.46 (V/SCE)
Fe Cu= -0.348 + (0.318-0.241)= -0.271 (V/SCE)
Air KranFe Zn= -0.74 + (0.318-0.241)= -0.663 (V/SCE)
Fe Cu= -0.195 + (0.318-0.241)= -0.118 (V/SCE)
Menghitung laju korosi masing masing logamr =
r Fe ==4.195 x 10-07 mpy
r Zn ==3.052 x 10-07 mpy
r Fe ==4.471 x 10-07 mpy
r Cu ==1.658 x 10-07 mpy
r Fe ==1.494 x 10-06 mpy
r Zn ==1.134 x 10-06 mpy
r Fe ==1.126 x 10-06 mpy
r Cu ==2.151 x 10-07 mpy
r Fe ==3.775 x 10-07 mpy
r Zn ==2.423 x 10-07 mpy
r Fe ==4.847 x 10-07 mpy
r Cu ==1.173 x 10-07 mpy