Influence of phosphate layer on adhesion properties between a steel surface and an organic coating

Scientific paper - Preliminary note / Short communication

• Title (croatian): Utjecaj fosfatnoga sloja na svojstva prianjanja između čelične površine i organskoga premaza
• Author: Marina Samardžija
• Author: Vesna Alar
• Author: Fedor Aljinović
• Author: Frankica Kapor
• Author's institution: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture
• Author's institution: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Interdisciplinary Technical Sciences
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract (english)

In this paper, tests of some physico-chemical properties of protective epoxy coating on non-alloy structural steel grade type S235JRG2 have been carried out. This is a significant construction material whose use is remarkably important for many steel products such as H beam, I beam, transmission towers, steel pipe etc. Coatings represent one of the ways to protect metal from corrosion. The properties of coating thickness, hardness, gloss, and adhesion were investigated. The same properties were tested by exposing the sample non-alloy steel plates to corrosive conditions of the salt and humid chamber and seawater. Part of the samples prior to application of the coating were immersed to phosphate solution to further investigate the effects of phosphatization on the properties of the coating. After exposure of the plates to the humidity chamber conditions, no traces of corrosion products, cracking or peeling of the coating were found on the surfaces. The plates tested in the sea water and salt chamber showed a minor damage on protective coating. The traitability properties were tested by the Pull off Adhesion test. Force pull adhesion off test shows less value for unphosphated samples than for phosphated ones.

Abstract (croatian)

U ovome radu provedena su ispitivanja nekih fizičko-kemijskih svojstava zaštitne epoksidne prevlake na nelegiranome strukturnom čeliku tipa S235JRG2. To je bitan konstrukcijski materijal čija je upotreba iznimno važna za mnoge proizvode od čelika poput H nosača, I nosača, prijenosnih tornjeva, čeličnih cijevi i slično. Jedna od najčešćih metoda zaštite metala od korozije jesu organski premazi. Ispitana su svojstva: debljina premaza, tvrdoća, sjaj te prionjivost. Nakon izlaganja uzoraka u slanoj i vlažnoj komori te potapanjem u morsku vodu ispitivana su ista svojstva kao i na početnim uzorcima. Dio uzoraka prije nanošenja premaza uronjen je u fosfatnu otopinu kako bi se dodatno ispitali učinci fosfatiranja na svojstva premaza. Nakon izlaganja pločica uvjetima vlažne komore na uzorcima nisu pronađeni tragovi korozijskih produkata, pucanja niti ljuštenja prevlake. Uzorci koji su bili izloženi morskoj vodi i slanoj komori pokazali su manja oštećenja zaštitnoga premaza. Svojstvo prionjivosti ispitano je Pull-off Adhesion testom. Sila Pull-off Adhesion testa pokazuje manje vrijednosti za nefosfatirane uzorke nego za fosfatirane.

• Keywords (english): corrosion; non-alloy steel grade; phosphatizing process; epoxy coating
• Keywords (croatian): korozija; nelegirani strukturni čelik; proces fosfatiranja; epoksidni premaz
• Language: english
• Language: croatian
• Publication type: Scientific paper - Preliminary note / Short communication
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Rudarsko-geološko-naftni zbornik
• Numbering: vol. 37, no. 1, pp. 11-17
• p-ISSN: 0353-4529
• e-ISSN: 1849-0409
• DOI: https://doi.org/10.17794/rgn.2022.1.2
• URN:NBN: urn:nbn:hr:169:262362
• Publication: 2022
• Document URL: https://hrcak.srce.hr/272004
• Type of resource: Text
• Access conditions: Open access
• Created on: 2025-04-24 08:52:53