Protikorozijska zaščita aluminijeve zlitine AA2024-T3 s hibridno prevleko

Race, Jan (author), Kranjc, Krištof (mentor)

Aluminijeve zlitine se zaradi majhne gostote pogosto uporabljajo v transportni industriji in drugod, kjer se pojavi potreba po majhni masi. Med pogosto uporabljenimi so gnetne zlitine iz serije 2xxx, med katere sodi tudi AA2024-T3. Aluminijeve zlitine imajo majhno korozijsko odpornost, kar zmanjšuje njihovo uporabnost. Zaradi tega je pomemben razvoj protikorozijske zaščite, ki izboljša odpornost zlitine proti koroziji. V diplomskem delu smo sintetizirali hibridno sol-gel prevleko za zaščito aluminijeve zlitine AA2024-T3. Učinkovitost prevleke smo ovrednotili v t.i. Harrisonovi raztopini (sestava v ut. %: 3,5 (NH$_4$)$_2$SO$_4$ + 0,5 NaCl). Protikorozijska prevleka je bila sintetizirana iz poli(bisfenol A-co-epiklorohidrina) (DGEBA), (3-glicidiloksipropil)trimetoksisilana (GPTMS), dietilentriamina (DETA), tetrahidrofurana (THF), tetraetil ortosilikata (TEOS), etanola in vode. Sinteza je bila na posameznih korakih priprave ovrednotena z infrardečo spektroskopijo. Učinkovitost zaščite pred korozijo je bila ovrednotena z elektrokemijsko impedančno spektroskopijo in s testom v slani-vlažni komori. Nanesena le nekaj mikrometrov debela zaščitna prevleka izkazuje dolgotrajno (večmesečno) korozijsko zaščito površine zlitine pred korozivnim okoljem.

• Language: Slovenian
• Keywords: korozija, aluminijeve zlitine, hibridne sol-gel prevleke, epoksi smole
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2024
• PID: 20.500.12556/RUL-156421
• COBISS.SI-ID: 197358083
• Publication date in RUL: 24.05.2024

Secondary language

• Language: English
• Title: Corrosion protection of the AA2024-T3 aluminum alloy using a hybrid coating

Abstract

Aluminum alloys are often used due to their low density in the transport industry and elsewhere where low masses are required. Among the most commonly used are wrought alloys from the 2xxx series, such as AA2024-T3. Aluminum alloys have low corrosion resistance which reduces their usability. Due to this it is important to develop corrosion protection that improves the resistance of alloys to corrosion. In this work we have synthesized a hybrid sol-gel coating for protection of the AA2024-T3 aluminum alloy. The efficiency of the coating has been evaluated in dilute Harrison solution (composition in wt. %: 3.5 (NH$_4$)$_2$SO$_4$ + 0.5 NaCl). The corrosion coating has been synthesized from poly(bisphenol A-co-epichlorohydrine) (DGEBA), (3-glycidyloxypropyl)trimetoxysylane (GPTMS), diethylenetriamine (DETA), tetrahydrofurane (THF), tetraethyl orthosilicate (TEOS), ethanol and water. Synthesis has been characterized by infrared spectroscopy at individual steps of preparation. The efficiency of corrosion protection has been determined via electrochemistry impedance spectroscopy and salt spray chamber test. An applied several-micrometer thick protective coating provides long-term (several-month) corrosion protection from the corrosive environment.

• Keywords: corrosion, aluminum alloys, hybrid sol-gel coatings, epoxy resins