Elektrokemijska svojstva superaustenitnog čelika

master's thesis

• Title (english): Electrochemical properties of superaustenitic steel
• Author: Nikolina Kelava
• Mentor: Vesna Alar (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-01-20, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

Visokolegirani čelici danas predstavljaju nezamjenjivu skupinu materijala. Zbog svoje odlične otpornosti na koroziju i dobrih mehaničkih svojstava imaju jako široko područje upotrebe. Primjenu pronalaze u industrijama poput prehrambene, kemijske i petrokemijske te u mljekarama i pivovarama. Koriste se za kućanske uređaje, alate te kao konstrukcijski materijal.
U teorijskom djelu rada prikazana je podjela nehrđajućih čelika, njihova glavna svojstva i karakteristike te legirni elementi i nečistoće koje se pojavljuju u tim čelicima. Detaljnije je opisana upotreba superaustenitnih čelika koji se posebno ističu svojim svojstvima. Obrađene su vrste lokalne korozije kojima su nehrđajući čelici skloni, poput rupičaste, interkristalne, korozije u procjepu te napetosne korozije. Objašnjen je princip elektrokemijskih ispitivanja kojima se pokazuje postoji li tendencija za nastanak korozije.
U eksperimentalnom dijelu rada su ispitivana korozijska svojstva austenitnog čelika AISI 316L i superaustenitnog čelika AISI 904L. Čelici su se ispitivali na 20 °C i 50 °C u ispitnoj otopini od 0,9 % i 3,5 % NaCl.

Abstract (english)

High-alloy steels today represent an irreplaceable group of materials. Due to their excellent corrosion resistance and good mechanical properties, they have a very wide range of applications. They are used in food, chemical and petrochemical industries, as well as in dairies and breweries. They are used for household appliances, tools and as a construction material.
The theoretical part of the paper presents the division of stainless steels, their main properties and characteristics, as well as alloying elements and impurities that occur in these steels. The use of superaustenitic steels, which stand out for their properties, is described in more detail. The types of local corrosion, to which stainless steels are prone, are explained, such as pitting, intergranular, crevice and stress corrosion. The principle of electrochemical tests is described, which shows whether there is a tendency for corrosion.
The corrosion properties of austenitic steel AISI 316L and superaustenitic steel AISI 904L were investigated in the experimental part of the paper. Steels were tested at 20 °C and 50 ° C in a solution of 0,9 % and 3,5 % NaCl.

• Keywords: nehrđajući čelik; korozijska postojanost; rupičasta korozija; elektrokemijska ispitivanja
• Keywords (english): stainless steel; corrosion resistance; perforation corrosion; electrochemical tests
• Language: croatian
• URN:NBN: urn:nbn:hr:235:130761
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-01-13 21:36:41