Istraživanje utjecaja visokih amplituda ulaznog signala kod impedancijskog ispitivanja sustava zaštitnih premaza

master's thesis

• Title (english): Investigation of the high input signal amplitude influence on the impedance testing of protective coating systems
• Author: Luka Bera
• Mentor: Sanja Martinez (mentor)
• Committee member: Sanja Martinez (predsjednik povjerenstva)
• Committee member: Helena Otmačić Ćurković (član povjerenstva)
• Committee member: Lidija Furač (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-07-02, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Zaštita metalnih površina ključna je za održivi razvoj društva. Potreba za što većim količinama metala javlja se iz dana u dan i ako ne osiguramo ispravnu zaštitu već postojećih metalnih konstrukcija može doći do značajnih šteta na imovini kao i do ugrožavanja sigurnosti ljudi i okoliša. Sastav i nanošenje organskih premaza imaju veliki značaj u zaštiti metalnih površina od korozije, ali također karakterizacija i konstantno praćenje ponašanja premaza igra veliku ulogu. Elektrokemijska impedancijska spektroskopija (EIS) kao metoda na bazi izmjenične struje ne narušava zaštitna svojstva sustava i omogućuje karakterizaciju stanja premaza pomoću ekvivalentnih električnih krugova. Kako bi dobili ispravne rezultate važno je obratiti pozornost na utjecaj smetnji, odnosno, elektromagnetskih interferencija koje djeluju induktivnim putem. Električni vodovi ili izvori napajanja najčešći su izvori elektromagnetskih smetnji koji mogu utjecati na točnost i preciznost EIS mjerenja. U ovom istraživanju provedena su ispitivanja utjecaja povećanja amplitude ulaznog signala na EIS mjerenja, pri različitima razinama interferencija, u laboratoriju i na terenu. Provedena su ispitivanja na tri istovrsne slijepe ćelije s četiri električna kruga različitih kombinacija kapaciteta i otpora. Laboratorijska ispitivanja provedena su u elektromagnetski izoliranim uvjetima – Faradayevom kavezu, a terenska ispitivanja provedena su u trafostanici, pored željeznice na izmjeničnu vuču i u laboratoriju van Faradayevog kaveza.

Abstract (english)

The protection of metal surfaces is crucial for the sustainable development of society. The need for as much metal as possible arises from day to day, and if we do not ensure proper protection of already existing metal structures, there can occur significant damage to the property as well as endangering the safety of people and the environment. The composition and application of organic coatings are of great importance in protecting metal surfaces from corrosion, but also the characterization and constant monitoring of the behavior of the coatings plays a major role. Electrochemical impedance spectroscopy (EIS) as a method based on alternating current does not impair the protective properties of the system and allows the characterization of the coating state by means of equivalent electrical circuits. In order to obtain correct results, it is important to pay attention to the influence of electromagnetic interference that act trought induction. Power lines or power sources are the most common sources of electromagnetic interferences that can affect the accuracy and precision of EIS measurements. In this study, the effect of increasing the amplitude of the input signal on EIS measurements under various leveles of interferencewas investigatedin laboratory and field conditions. Tests were performed on three simultaneous dummy cells with four electrical circuits of different combinations of capacitance and resistance. Laboratory tests were conducted under electromagnetically isolated conditions - Faraday's cage, field tests were conducted in the power substation, iclose to the AC traction rail and in the laboratory outside the Faraday cage.

• Keywords: organski premazi; elektrokemijska impedancija spektroskopija; slijepa ćelija; smetnje
• Keywords (english): organic coatings; electrochemical impedance spectroscopy; blind cell; noises
• Language: croatian
• URN:NBN: urn:nbn:hr:149:046019
• Study programme: Title: Chemical Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-04-06 12:47:00