Rupičasta korozija zavarenih spojeva nehrđajućih čelika

undergraduate thesis

• Title (english): Pitting corrosion of stainless steel welded joints
• Author: Marko Piličić
• Mentor: Vinko Šimunović (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2021-09-29, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

Visokolegirani korozijski postojani Cr-Ni čelici imaju široku primjenu u različitim područjima. Bitna su skupina konstrukcijskih materijala te su nezamjenjivi u prehrambenoj, farmaceutskoj i kemijskoj industriji te u medicini.
Za očuvanje korozijske postojanosti nehrđajućih čelika važno je održavati homogenost tankog površinskog filma kromovih oksida. Zaostali toplinski oksidi u području zavarenih spojeva bitno narušavaju korozijsku postojanost nehrđajućih čelika te ih je važno ukloniti mehaničkom, kemijskom, elektrokemijskom ili kombinacijom tih obrada.
U radu su opisane vrste, svojstva nehrđajućih čelika, korozijske pojave koje se javljaju u područjima zavarenih spojeva, a detaljno je opisana rupičasta korozija i važnost obrade područja zavarenog spoja nehrđajućeg čelika.
U eksperimentalnom dijelu rada provedeno je korozijsko ispitivanje otpornosti zavarenih spojeva od superaustenitnog (EN 1.4547) i superdupleks čelika (EN 1.4501) prema normi ASTM G-48 te su analizirani dobiveni rezultati.

Abstract (english)

High-alloyed, corrosion-resistant Cr-Ni steels are widely used in various fields. They are an important group of structural materials and are indispensable in the food, pharmaceutical and chemical industries and in medicine.
It is important for pitting corrosion resistance of stainless steels to maintain the homogeneity of the thin surface film of chromium oxides. Residual thermal oxides in the area of welded joints significantly impair the corrosion resistance of stainless steels and it is important to remove them by mechanical, chemical, electrochemical or a combination of these treatments.
The work describes the types, properties, corrosion phenomena that occur in the areas of welded joints of stainless steel and describes in detail the pitting corrosion and the importance of surface treatment of the area of the welded joint of stainless steel.
In the experimental part of the work, the corrosion test of the resistance of welded joints from superaustenitic (EN 1.4547) and superduplex steel (EN 1.4501) is carried out according to the standard ASTM G-48 and the results are analyzed.

• Keywords: rupičasta korozija; zavareni spoj; korozijska postojanost; nehrđajući čelik
• Keywords (english): pitting corrosion; welded joint; corrosion resistance; stainless steel
• Language: croatian
• URN:NBN: urn:nbn:hr:235:443406
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering; Course: Production Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-09-22 14:43:27