Pengaruh Waktu Terhadap Laju Korosi Logam Fe dan Cr Pada Baja SS 316 Dalam Medium HCl 3M Dengan Inhibitor Ekstrak Metanol Daun Kopi
vi
PENGARUH WAKTU TERHADAP LAJU KOROSI LOGAM Fe DAN Cr
PADA BAJA SS 316 DALAM MEDIUM HCl 3M DENGAN
INHIBITOREKSTRAK METANOL DAUN KOPI
( Coffea Robusta L )
ABSTRAK
Pengaruh waktu terhadap laju korosi logam Fe dan Cr pada baja SS 316 dalam
medium asam klorida (HCl) 3M telah diteliti dengan menggunakan metode uji
pengurangan berat (Weight Loss Test) yaitu dengan perendaman Baja SS 316 dalam
variasi waktu 10, 20, dan 30 hari dalam HCl 3M selanjutnya perendaman inhibitor
daun kopi (Coffea Robusta L)dengan konsentrasi 6000 ppm selama 24 jam lalu HCl
3M dalam variasi waktu 10, 20 dan 30 hari. Hasil penelitian menunjukkan bahwa laju
korosi tertinggididalam HCl 3Mpada logam Fe yaitu perendaman 30 hari sebesar
126,931 mpy serta padalogam Cr yaitu perendaman 30 hari sebesar 47,857
mpyselanjutnya perendaman didalam inhibitor 6000 ppm selama 24 jam lalu HCl 3M
diperoleh laju korosi terendah logam Fe sebesar 5,733 mpy pada perendaman 30
haridengan efisiensi inhibitor maksimumyaitu 95,5%sedangkan laju korosi terendah
logam Crsebesar 2,447 mpypada perendaman 10 hari dengan efisiensi inhibitor
maksimum yaitu 90,62% yang diuji dengan alat Spektrofotometer Serapan Atom.
Hasil morfologi permukaan masing – masing baja sebelum dan sesudah terkorosi juga
memperlihatkan hasil yang sangat signifikan, dimana dapat dilihat bahwa Baja SS
316sangat mudah terkorosi dalam media HCl 3M.
Kata kunci: Korosi, Laju Korosi Logam, Baja SS 316, Inhibitor
Universitas Sumatera Utara
vii
EFFECT TIME OF THECORROSION RATE OF METALS Fe AND Cr ON
STEEL SS 316 IN MEDIUM HYDROCHLORIC ACID (HCl)
3M WITHMETHANOL EXTRACT OF LEAVES OF COFFEE
INHIBITOR (Coffea Robusta L)
ABSTRACT
Effect time of the corrosion of metals Fe and Cr on steel SS 316 in medium
hydrochloric acid (HCl) 3M has been investigated by using the method of weight
reduction test, namely soaking Steel SS 316 in the time variation of 10, 20, and 30
days in immersion HCl 3M and inhibitor of coffee leaves (Coffea Robusta L)with
concentration of 6000 ppm for 24 hours then HCl 3M in the time variation of 10, 20
and 30 days. The results showed that is the highest corrosion in HCl 3M rate Fe ofin
soaking 30 days is 126.931 mpy as well as on the Cr immersion of 30 days isequal to
47.857 mpy further immersion in the inhibitor 6000 ppm for 24 hours and then HCl
3M obtained the corrosion rate of the lowest Fe is 5.733 mpy on the immersion in 30
days with maximum inhibition efficiency is 95.5%, while the corrosion rate of the
lowest Cr is 2,447 mpyon immersion in 10 days with a maximum inhibition efficiency
is 90.62% by using Atomic Absorption Spectroscopy instrument. Results of surface
morphology of each - before and after the corroded steel also showed highly significant
results, which can be seen that Steel SS 316 very easily corroded inHCl3M.
Keywords: Corrosion, Corrosion Rate of Metal, Steel SS 316, Inhibitor
Universitas Sumatera Utara
PENGARUH WAKTU TERHADAP LAJU KOROSI LOGAM Fe DAN Cr
PADA BAJA SS 316 DALAM MEDIUM HCl 3M DENGAN
INHIBITOREKSTRAK METANOL DAUN KOPI
( Coffea Robusta L )
ABSTRAK
Pengaruh waktu terhadap laju korosi logam Fe dan Cr pada baja SS 316 dalam
medium asam klorida (HCl) 3M telah diteliti dengan menggunakan metode uji
pengurangan berat (Weight Loss Test) yaitu dengan perendaman Baja SS 316 dalam
variasi waktu 10, 20, dan 30 hari dalam HCl 3M selanjutnya perendaman inhibitor
daun kopi (Coffea Robusta L)dengan konsentrasi 6000 ppm selama 24 jam lalu HCl
3M dalam variasi waktu 10, 20 dan 30 hari. Hasil penelitian menunjukkan bahwa laju
korosi tertinggididalam HCl 3Mpada logam Fe yaitu perendaman 30 hari sebesar
126,931 mpy serta padalogam Cr yaitu perendaman 30 hari sebesar 47,857
mpyselanjutnya perendaman didalam inhibitor 6000 ppm selama 24 jam lalu HCl 3M
diperoleh laju korosi terendah logam Fe sebesar 5,733 mpy pada perendaman 30
haridengan efisiensi inhibitor maksimumyaitu 95,5%sedangkan laju korosi terendah
logam Crsebesar 2,447 mpypada perendaman 10 hari dengan efisiensi inhibitor
maksimum yaitu 90,62% yang diuji dengan alat Spektrofotometer Serapan Atom.
Hasil morfologi permukaan masing – masing baja sebelum dan sesudah terkorosi juga
memperlihatkan hasil yang sangat signifikan, dimana dapat dilihat bahwa Baja SS
316sangat mudah terkorosi dalam media HCl 3M.
Kata kunci: Korosi, Laju Korosi Logam, Baja SS 316, Inhibitor
Universitas Sumatera Utara
vii
EFFECT TIME OF THECORROSION RATE OF METALS Fe AND Cr ON
STEEL SS 316 IN MEDIUM HYDROCHLORIC ACID (HCl)
3M WITHMETHANOL EXTRACT OF LEAVES OF COFFEE
INHIBITOR (Coffea Robusta L)
ABSTRACT
Effect time of the corrosion of metals Fe and Cr on steel SS 316 in medium
hydrochloric acid (HCl) 3M has been investigated by using the method of weight
reduction test, namely soaking Steel SS 316 in the time variation of 10, 20, and 30
days in immersion HCl 3M and inhibitor of coffee leaves (Coffea Robusta L)with
concentration of 6000 ppm for 24 hours then HCl 3M in the time variation of 10, 20
and 30 days. The results showed that is the highest corrosion in HCl 3M rate Fe ofin
soaking 30 days is 126.931 mpy as well as on the Cr immersion of 30 days isequal to
47.857 mpy further immersion in the inhibitor 6000 ppm for 24 hours and then HCl
3M obtained the corrosion rate of the lowest Fe is 5.733 mpy on the immersion in 30
days with maximum inhibition efficiency is 95.5%, while the corrosion rate of the
lowest Cr is 2,447 mpyon immersion in 10 days with a maximum inhibition efficiency
is 90.62% by using Atomic Absorption Spectroscopy instrument. Results of surface
morphology of each - before and after the corroded steel also showed highly significant
results, which can be seen that Steel SS 316 very easily corroded inHCl3M.
Keywords: Corrosion, Corrosion Rate of Metal, Steel SS 316, Inhibitor
Universitas Sumatera Utara