Projektiranje naprave za korozijsko ispitivanje uranjanjem

master's thesis

• Author: Goran Mance
• Mentor: Ivan Juraga (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2008-11-19, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Diplomski rad se sastoji od teorijskog, eksperimentalnog i praktičnog dijela. U teorijskom dijelu opisano je korozijsko djelovanje na materijale te detaljno objašnjene reakcije i mehanizmi elektrokemijske korozije. Posebno su naglašene korozijske reakcije u slanim vodenim otopinama budući da su relevantne za kasnije prikazana ispitivanja uranjanjem. U sklopu priprema za konstruiranje naprave analizirana je norma ASTM G44 koja propisuje način ispitivanja cikličkim uranjanjem. Poštivajući odredbe norme, pristupilo se prvo izradi idejnog, a zatim i konačnog konstrukcijskog rješenja naprave za ispitivanje uranjanjem. U praktičnom djelu rada, naprava je izrađena u jednom primjerku prema dokumentaciji iz konstrukcijskog rješenja. Naprava je postavljena u prostorije Laboratorija za zaštitu materijala Fakulteta Strojarstva i Brodogradnje Sveučilišta u Zagrebu te pripremljena za početak rada. U eksperimentalnom dijelu rada ispitivane su dvije serije uzoraka u različitim trajanjima (5 sati i 90 sati). Prvim ispitivanjem je utvrđena točnost i pouzdanost rada naprave. Drugo ispitivanje je provedeno na šest uzoraka od ugljičnog čelika uronjenih u različite korozivne vodene otopine. Drugo ispitivanje je pokazalo ubrzanost odvijanja korozije pri cikličkom uranjanju te neučinkovitost inhibitora korozije ukoliko su primijenjeni u nedostatnoj količini. Naprava za ispitivanje naizmjeničnim uranjanjem je uspješno konstruirana, izrađena i puštena u rad bez poteškoća, čime je u potpunosti ispunjen zadatak ovog diplomskog rada.

Abstract (english)

This thesis includes theoretical, experimental and practical part. Theoretical part describes corrosion influence on materials and specifies reactions and mechanisms of electrochemical corrosion. Special attention was given to corrosion reactions in salty aqueous solutions as they are relevant to later described immersion testing. As a part of preparations prior to apparatus construction standard ASTM G44 was analyzed. Standard ASTM G44 provided guidelines for alternating immersion testing. Respecting directions of the sandard the draft design was produced first and was later followed by final construction design for the immersion apparatus. Concluding practical thesis part, single apparatus was produced according to final design blueprints. Apparatus was installed and prepared for operation in the Laboratory for material protection on the Faculty of Mechanical Engineering and Naval Architecture in Zagreb University. Experimental part describes immersion testing of two sets of specimens for different duration periods (5 hours and 90 hours). Purpose of the first test was to establish apparatus precision and reliability. Second test was conducted for six carbon steel specimens immersed in various corrosive aqueous solutions. This testing demonstrated accelerated corroding during alternating immersion and inefficiency of corrosion inhibitors if applied inadequately. Alternating immersion testing apparatus was successfully constructed, manufactured and applied which fulfils the goal of this thesis.

• Keywords: korozijsko ispitivanje; strojna obrada; naprava; uređaji
• Language: croatian
• URN:NBN: urn:nbn:hr:235:688101
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: diplomirani inženjer/inženjerka strojarstva (diplomirani inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-21 14:05:31