Ocena właściwości antykorozyjnych powłok konwersyjnych wytworzonych na magnezie i jego stopach w procesie elektrolitycznego utleniania plazmowego– przegląd

• Autorzy: Florczak Łukasz

Identyfikatory

DOI

10.15199/40.2021.10.1

Warianty tytułu

EN

Assessment of anti-corrosion properties of conversion coatings produced on magnesium and its alloys in the process of plasma electrolytic oxidation – review

• Języki publikacji: PL

Abstrakty

PL

W pracy wskazano na wciąż duże zainteresowanie magnezem i jego stopami z Al, Zn, Mn, Zr oraz pierwiastkami ziem rzadkich oraz krótko opisano kierunki aktualnych badań dotyczących metody elektrolitycznego utleniania plazmowego (PEO) jako metody zwiększającej odporność antykorozyjną stopów magnezu. Zaprezentowano metody pomiarowe służące do oceny właściwości antykorozyjnych powłok konwersyjnych wytworzonych w procesie PEO na magnezie i jego stopach. Opisano zalety i wady metod nieelektrochemicznych i elektrochemicznych, w tym: test w komorze solnej, test zanurzeniowy (ocena wyglądu, ubytek masy, zbieranie wodoru) oraz pomiary potencjału obwodu otwartego (OCP), polaryzacji potencjodynamicznej (PDP), analizę Motty-Schottky’ego oraz elektrochemiczną spektroskopię impedancyjną (EIS). Wykazano przewagę techniki EIS nad niszczącymi pomiarami elektrochemicznymi, która pozwala na prowadzenie nieniszczących pomiarów długoterminowych wytworzonych powłok ochronnych. Dokonano przeglądu roztworów korozyjnych, najczęściej stosowanych do oceny właściwości antykorozyjnych powłok konwersyjnych oraz wskazano rozcieńczony roztwór Harrisona (DHS), jako odpowiednie medium do badań cienkich powłok (~10 μm) wytworzonych metodą PEO na stopach magnezu przeznaczonych do zastosowań w warunkach przemysłowych. Zwrócono uwagę na konieczność właściwego doboru czasu trwania pomiarów korozyjnych w zależności od właściwości powłoki oraz jej potencjalnego zastosowania.

EN

The paper shows the unfailing interest in magnesium and its alloys with Al, Zn, Mn, Zr and rare earth elements, and briefly describes the directions of current research on the method of plasma electrolytic oxidation (PEO) as a method of increasing the corrosion resistance of magnesium alloys. The measurement methods for the assessment of anti-corrosion properties of conversion coatings produced in the PEO process on magnesium and its alloys are presented. Described are the advantages and disadvantages of non-electrochemical and electrochemical methods, including: salt spray test, immersion test (assessment of appearance, weight loss, hydrogen collection) and measurements of the open circuit potential (OCP), potentiodynamic polarization (PDP), Motta-Schottky analysis and electrochemical impedance spectroscopy (EIS). The advantage of the EIS technique over destructive electrochemical measurements has been demonstrated, which allows for non-destructive long-term measurements of the produced protective coatings. The most common corrosive solutions used to assess the anti-corrosive properties of conversion coatings were reviewed and the diluted Harrison solution (DHS) was indicated as a suitable medium for testing thin coatings (~10 μm) produced by the PEO method on magnesium alloys intended for use in industrial conditions. The necessity of proper selection of the duration of corrosion measurements depending on the properties of the coating and its potential application has been pointed out.

Słowa kluczowe

PL

stopy magnezu; PEO; właściwości antykorozyjne; EIS; DHS

EN

magnesium alloy; PEO; anticorrosion properties; EIS; DHS

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Ochrona przed Korozją
• Rocznik: 2021
• Tom: nr 10
• Strony: 320--331
• Opis fizyczny: Bibliogr. 103 poz., fot., wykr.

Twórcy

autor

Florczak Łukasz

• Politechnika Rzeszowska, Wydział Chemiczny

• https://orcid.org/0000-0003-3368-275X

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