Fosfonske kiseline kao promotori adhezije vodorazrjedivog premaza

master's thesis

• Title (english): Phosphonic acids as adhesion promoters of water-based coating
• Author: Tea Kokot
• Mentor: Helena Otmačić Ćurković (mentor)
• Committee member: Helena Otmačić Ćurković (predsjednik povjerenstva)
• Committee member: Ljerka Kratofil Krehula (član povjerenstva)
• Committee member: Marko Viskić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2023-09-21, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Premazi na bazi organskih otapala često se koriste u zaštiti metala od korozije, međutim otkriveno je da oni predstavljaju rizik za zdravlje ljudi i okoliš zbog isparavanja toksičnih hlapljivih organskih spojeva. Stoga su ekološki prihvatljivi vodorazrjedivi premazi danas stekli značajnu pažnju zbog njihovog smanjenog udjela hlapljivih organskih spojeva. Problem sa čistim vodorazrjedivim premazima je što oni sadrže hidrofilne skupine i surfaktante zbog čega korozivni ioni i molekule vode mogu lako prolaziti kroz premaz, što onda uzrokuje slaba barijerna svojstva tih premaza. Dodavanje zaštitnih punila ili inhibitora korozije u takve premaze se pokazalo dobrim načinom poboljšanja barijernih svojstava. Primjer takvih spojeva su fosfonske kiseline koje mogu imati ulogu inhibitora korozije i promotora adhezije premaza. U ovom radu su ispitane dvije vrste dugolančanih kiselina, hidroklorid
12-aminododecilfosfonske kiseline i 12-fosfonododecilfosfonska kiselina u kombinaciji sa vodorazrjedivim akrilatnim premazom. Korištene su CuSn12 brončane elektrode čija je površina oksidirana. Ispitivane kiseline nanošene su na površinu bronce metodom uranjana i metodom kista. Elektrode su izlagane otopini kisele kiše (pH = 5) te su u periodu od 10 dana provedena EIS mjerenja, a potom se površina elektroda analizirala optičkim mikroskopom. Također je provedena pull-off metoda za određivanje adhezije premaza.

Abstract (english)

Organic solvent based coatings are often used for corrosion protection of metals, however they have been found to pose a risk to human health and the environment due to the evaporation of toxic volatile organic compounds. Therefore, eco-friendly water-based coatings have attracted increasing attention in recent years. Unfortunately, water-based coatings contain hydrophilic groups and surfactants, so that corrosive ions and water molecules can easily pass through the coating, leading to poorer barrier properties. Incorporation of protective fillers into these coatings was shown as a viable way to address this issue. An example of compounds commonly used as fillers are phosphonic acids, which could act as corrosion inhibitors and adhesion promoters. In this study, two types of long chain acids, 12-aminododecylphosphonic acid hydrochloride and
(12-phosphonododecyl)phosphonic acid in combination with a water-borne acrylic coating, were examined. As electrodes were used CuSn12 bronze electrodes whose surface was oxidized. Examined acids were applied on the surface of bronze by immersion method and brush method. The electrodes were exposed to a solution of acid rain (pH = 5) and
EIS measurements were performed over a period of 10 days, and then the surface of the electrodes was analyzed with optical microscope. The pull-off test was also performed to determine the coating adhesion.

• Keywords: vodorazrjedivi premazi; bronca; korozija; fosfonske kiseline
• Keywords (english): water-based coatings; bronze; corrosion; phosphonic acids
• Language: croatian
• URN:NBN: urn:nbn:hr:149:694594
• Project: Number: IP-2019-04-5030; Title: Razvoj novih rješenja za karakterizaciju i zaštitu brončane kulturne baštine izložene vanjskom okolišu; Title: Development of New Solutions for Characterization and Protection of Bronze Cultural Heritage Exposed to Outdoor Environment; Acronym: BroCH; Leader: Helena Otmačić Ćurković; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Environmental chemistry and green technologies; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra primijenjene kemije (sveučilišni/a magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-11-15 14:08:02