Oxidation Resistance of the Coatings Obtained by Plasma Electrolytic Oxidation on Aluminium Alloys
Oksidacioni otpor premaza nanetih plazma elektrolitičkom oksidacijom na legurama aluminijuma
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Author
Kuznetsov, Yury
Keywords
oxide-ceramic coatingplasma-electrolytic oxidation
electrolyte
aluminum alloy
corrosion medium
pole curve
oksido-keramički premaz
plazma elektrolitička oksidacija
elektrolit
legura aluminijuma
korozivno sredstvo
polna kriva
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Show full item recordAbstract
Plasma electrolytic oxidation (PEO) is one of the new methods of obtaining thin layer oxide ceramic coatings on machine elements of different purpose of use; that allows considerably increase their durability.
This paper outlines the results of experimental studies on corrosion resistance of oxide ceramic coatings formed by PEO on various aluminum alloys using КОН-Н3ВО3 electrolyte.
Corrosion tests of the samples were performed using the following two methods:
1. According to ASTM G44 “Standard Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5% Sodium Chloride Solution”,
2. Polarization tests.
Both tests of corrosion resistance of aluminum alloys clearly demonstrate that plasma electrolytic oxidation significantly improves corrosion resistance: depending on an alloy, corrosion rates of PEO coated samples are by the factor of 2.5-80 lower as compared with non-coated samples. Plazma elektrolitička oksidacija (PEO) je jedan od novih metoda za dobijanje oksidno keramičkih premaza u tankim slojevima na elementima mašina različite namene, što značajno produžava njihov vek trajanja.
U ovom radu su izneti rezultati eksperimentalnih istraživanja otpora na koroziju oksidno keramičkih premaza nanetih pomoću PEO na različite aluminijumske legure upotrebom elektrolita КОН-Н3ВО3.
Testovi korozije na uzorcima su izvođeni upotrebom sledeće dve metode:
1. Prema ASTM G44 “Standardna praksa za izlaganje metala i legura alternativnim potapanjem u neutralni 3.5% rastvor natrijum hlorida”,
2. Testovi polarizacije.
Oba testa otpornosti na koroziju aluminijumskih legura jasno su pokazala da plazma elektrolitička oksidacija značajno poboljšava otpornost na koroziju: zavisno od legure, stepeni korozije PEO zaštićenih uzoraka su 2.5-80 puta niži u poređenju sa uzorcima bez premaza.