Functional properties of the novel hybrid coatings combined of the oxide and DLC layer as a protective coating for AZ91E magnesium alloy

SURFACE & COATINGS TECHNOLOGY

卷:380

Article

Molak, R. M.¹  Topolski, K.²  Spychalski, M.²  Dulinska-Molak, I.²  Moronczyk, B.²  Pakiela, Z.²  Nieuzyla, L.³  Mazurkiewicz, M.⁴  Wojucki, M.⁵  Gebeshuber, A.⁶  Piotrowska, N.² 

[1] Bialystok Tech Univ, Fac Mech Engn, Wiejska 45C, PL-15352 Bialystok, Poland

[2] Warsaw Univ Technol, Fac Mat Sci & Engn, Woloska 141, PL-02507 Warsaw, Poland

[3] Silesian Tech Univ, Fac Chem, Marcina Strzody 9, PL-44100 Gliwice, Poland

[4] Warsaw Univ Technol, Fac Chem & Proc Engn, Warynskiego 1, PL-00645 Warsaw, Poland

[5] Inst Precis Mech, Duchnicka 3, PL-01796 Warsaw, Poland

[6] Rubig GmbH & Co KG Hartetech, Griesmuhlstr 10, A-4614 Marchtrenk, Austria

关键词: Coating;    Plasma electrolytic oxidation;    Diamond-like carbon;    Corrosion;    Wear;    Magnesium alloy;   

DOI  :  10.1016/j.surfcoat.2019.125040

来源: Elsevier

【 摘 要 】

Magnesium alloys are essential materials for aircraft applications however their corrosion protection is still a challenge and restriction from the spread of the applications. Owing to there is still need to search a new way to protect magnesium alloys from corrosion in replacement of currently used chromate coatings which manufacturing process is dangerous and harmful for living organism and will be soon forbidden by law restrictions. In this work, the novel surface modification of magnesium alloy AZ91E was realized. A novel hybrid coating made by combining of the oxide and Diamond-Like Carbon (DLC) layer were elaborated and explored to find out is there any improvements in functional properties when compared to chromate coatings. The corrosion testing in 3.5% NaCl solution and salt fog condition revealed the clear improvements in corrosion protection of AZ91E alloy. Additionally, It was found that oxide coating has lower microhardness and young modulus when compared to DLC and thus it decreases internals stress within the hybrid coating. The wear test revealed that DLC coating significantly improves abrasion resistance when compared to raw, unmodified AZ91 or AZ91E covered with chromate coating.

【 授权许可】

Free