کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1639981 1517047 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Deposition of electroless Ni-P/Ni-W-P duplex coatings on AZ91D magnesium alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Deposition of electroless Ni-P/Ni-W-P duplex coatings on AZ91D magnesium alloy
چکیده انگلیسی

The electroless Ni-P/Ni-W-P duplex coatings were deposited directly on AZ91D magnesium alloy by an acid-sulfate nickel bath. Nickel sulphate and sodium tungstate were used as metal ion sources and sodium hypophosphite was used as reducing agent. The coating was characterized for its structure, morphologies, microhardness and corrosion properties. The presence of dense and coarse nodules in the duplex coatings was observed by SEM and EDS. Tungsten content in Ni-P/Ni-W-P alloy is about 0.65%(mass fraction) and the phosphorus content is 8.18%(mass fraction). The microhardness of the coatings is 622 VHN. The coating shows good adhesion to the substrate. The results of electrochemical analysis, the porosity and the immersion test show that Ni-P/Ni-W-P duplex coatings possess noble anticorrosion properties to protect the AZ91D magnesium alloy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 18, Supplement 1, December 2008, Pages s323-s328