scholarly journals Carbon Steel Corrosion In The Atmosphere, Cooling Water Systems, And Hot Water

FLUIDA ◽  
1970 ◽  
Vol 11 (1) ◽  
pp. 7-14
Author(s):  
Gatot Subiyanto ◽  
Agustinus Ngatin
Keyword(s):  
Carbon Steel ◽  
Cooling Water ◽  
Steel Corrosion ◽  
Water Systems ◽  
Hot Water

Korosi merupakan proses kerusakan material akibat berinteraksi dengan lingkungan yang korosif. Untuk mempelajari proses korosi di industri, maka dilakukan pengujian korosi di atmosfer, simulasi dalam skala lab untuk sistem air pendingin dan sistem air panas. Pengujian korosi dilakukan pada material baja lunak dengan metode Coupon dan laju korosi dihitung berdasarkan metode kehilangan berat. Penelitian ini bertujuan untuk menentukan laju korosi di lingkungan atmosfer, air pendingin, dan air panas berdasarkan pengaruh waktu. Hasil pengujian korosi di atmosfer menunjukkan bahwa lingkungan sekitar laboratorium kimia (gedung A) masih sangat baik dengan laju korosi 0,39mpy, sistem air pendingin mencapai 3,52 mpy dan di sistem air panas mencapai 137,12 mpy. Produk korosi dari ke tiga sistem berupa lapisan berwarna coklat dari Fe2O3.xH2O atau FeO(OH) menempel di permukaan logam. Dari ketiga lingkungan yang menunjukkan laju korosi terbesar adalah di sistem air panas.Pengendalian dengan coating dan proteksi katodik anoda korban dapat menurunkan potensial baja sampai dibawah kriteria proteksi (<-850mV/CSE), untuk coating mencapai – 896 mV/CSE, proteksi katodik anoda korban Mg dapat mencapai – 1696 mV/CSE, sedangkan potensial baja telanjang -762 mv/CSE

Study on the efficiency of some amine derivatives as corrosion and scale inhibitors in cooling water systems

RSC Advances ◽  
2015 ◽  
Vol 5 (71) ◽  
pp. 57254-57262 ◽  
Author(s):  
M. A. Migahed ◽  
A. A. Attia ◽  
R. E. Habib
Keyword(s):  
Carbon Steel ◽  
Cooling Water ◽  
Water Systems

A study on the corrosion and scaling inhibition efficiencies of some amine derivatives for carbon steel.

Synergistic inhibition of carbon steel corrosion by sodium tungstate and sodium silicate in neutral aqueous media

2002 ◽  
Vol 49 (6) ◽  
pp. 433-443 ◽  
Author(s):  
V.S. Saji ◽  
S.M.A. Shibli
Keyword(s):  
Carbon Steel ◽  
Sodium Silicate ◽  
Sodium Tungstate ◽  
Aqueous Media ◽  
Water System ◽  
Cooling Water ◽  
Steel Corrosion ◽  
Synergistic Inhibition ◽  
Metal Oxide Layer ◽  
The Individual

Tungstate inhibitors are seldom used alone in open recirculating cooling water systems due to their low oxidising ability and high cost. The objective of the present work was to develop efficient synergistic inhibitor combinations comprising sodium silicate and very low concentration of sodium tungstate, keeping in view of their application in industrial cooling water system. It was demonstrated in the present study that all the combinations of the inhibitors exhibited synergistic benefit and higher inhibition efficiencies than did either of the individual inhibitors. It was also established that a 4:1 ratio of sodium silicate to sodium tungstate (total 1,000 ppm) was the best overall combination. The FTIR spectra also suggest that tungstate and silicate ions were incorporated in the passivating metal oxide layer formed on the surface of carbon steel in the inhibitor solutions. The effects of excess and depleted concentrations of the individual inhibitor components on overall inhibition behaviour are also discussed.

Inhibition effect of phosphorus-based chemicals on corrosion of carbon steel in secondary-treated municipal wastewater

2013 ◽  
Vol 67 (11) ◽  
pp. 2412-2417 ◽  
Author(s):  
Zhanhui Shen ◽  
Hongqiang Ren ◽  
Ke Xu ◽  
Jinju Geng ◽  
Lili Ding
Keyword(s):  
Carbon Steel ◽  
Municipal Wastewater ◽  
Electrochemical Impedance ◽  
Cooling Water ◽  
Water Systems ◽  
Protective Film ◽  
Steel Electrode ◽  
Inhibition Effect ◽  
Treated Municipal Wastewater ◽  
Alternative Water

Secondary-treated municipal wastewater (MWW) could supply a viable alternative water resource for cooling water systems. Inorganic salts in the concentrated cooling water pose a great challenge to corrosion control chemicals. In this study, the inhibition effect of 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP), trimethylene phosphonic acid (ATMP) and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) on corrosion of carbon steel in secondary-treated MWW was investigated by the means of potentiodynamic polarization and electrochemical impedance spectroscopy. The inhibition effect increased with increasing concentration of inhibitors. The corrosion rates of carbon steel were 1.5, 0.8, 0.2 and 0.5 mm a–1 for blank, HEDP, ATMP and PBTCA samples at 50 mg L–1, respectively. The phosphorus-based chemicals could adsorb onto the surface of the carbon steel electrode, form a coat of protective film and then protect the carbon steel from corrosion in the test solution.

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