Korozijska zaštita ugljičnog čelika fosfonskim kiselinama

undergraduate thesis

• Title (english): Corrosion protection of carbon steel by phosponic acids
• Author: Doroteja Novosel
• Mentor: Helena Otmačić Ćurković (mentor)
• Committee member: Marijana Kraljić Roković (predsjednik povjerenstva)
• Committee member: Helena Otmačić Ćurković (član povjerenstva)
• Committee member: Aleksandra Sander (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2015-09-18, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Chemical Engineering in Material Development

Abstract

Cilj ovog rada bio je ispitati mogućnost zaštite ugljičnog čelika C45E od korozije u umjetnoj morskoj vodi primjenom zaštitnog filma oktadecilfosfonske kiseline (ODPA). On je formiran postupkom uranjanja čelika u alkoholne otopine fosfonske kiseline različitih koncentracija: 10^-2 M, 5*10^-3 M, 10^-3 M te u otopini CeCl3 * 7 H2O koncentracije 2mM, a potom u otopini ODPA koncentracije 10^-2 M.
Rezultati su pokazali da je čelik uranjan u otopinu oktadecilfosfonske kiseline najmanje koncentracije 10^-3 M pokazao najveću otpornost prema koroziji tj. 1,5 puta veći otpor te djelotvornost inhibitora od 45% u odnosu na netretirani uzorak.
U drugom ispitivanju, provedenom na uzorcima koji su tretirani sa CeCl3 * 7 H2O i ODPA, izmjeren je 9 puta veći otpor čelika prema koroziji te djelotvornost inhibitora od 92% u odnosu na nezaštićeni čelik.

Abstract (english)

The aim of this work was to investigate the possibility of corrosion protection carbon steel C45E in artificial sea water by applying protective film of octadecylphosphonic acid. The film was formed by dip coating of steel in ethanol solutions of different concentration of phosphonic acid: 10^-2 M, 5*10^-3 M, 10^-3 M; also other samples in solution of CeCl3 * 7 H2O concentration 2mM, and after in solution ODPA concentration: 10^-2 M. Results have shown that steel dip coated in solution with the lowest concentration of ODPA (10^-3) has the biggest resistance to corrosion, the 1,5 higher polarization resistance and inhibitor efficiency of 45% regarding to untreated steel. In second research, on samples which are treated with CeCl3 * 7 H2O i ODPA it has been measured 9 times bigger polarization resistance and inhibitor efficiency of 92% regarding to untreated steel.

• Keywords: korozija; korozijska zaštita; samoorganizirajući monosloj; ugljični čelik C45E
• Keywords (english): corrosion; corrosion protection; self-assembled monolayer; carbon steel C45E
• Language: croatian
• URN:NBN: urn:nbn:hr:149:880181
• Study programme: Title: Chemical Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb
• Created on: 2016-12-02 14:43:03