کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1658492 1008343 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of phosphate pretreatment and hot-humid environmental exposure on static strength of adhesive-bonded magnesium AZ31 sheets
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Effects of phosphate pretreatment and hot-humid environmental exposure on static strength of adhesive-bonded magnesium AZ31 sheets
چکیده انگلیسی

An innovative phosphate–permanganate surface treatment (PPT) was developed to improve the static strength of adhesive-bonded 4 mm thick magnesium AZ31 sheets. The phosphate coating having the chemical composition of 1.43% P, 1.63% F and 0.15% Mn (in mass %) was formed after the treatment with PPT solution which has the formulation of KMnO4, K2HPO4, Na2SiO3 and NaF. The combination of additives NaF and Na2SiO3 and the pH values in the range of 5–6 for a phosphate–permanganate solution was found to be the key elements for the formation of the phosphate coating. The appearance of the phosphate coating and corrosion resistance to 3.5%NaCl solution was assessed. To study the durability of the coating, the effect of an exposure in a hot-humid environment (96% R.H. at 40 °C) on the static strength of adhesive-bonded magnesium AZ31 was investigated. Test results showed that the phosphate coating improved not only the static strength of bonded magnesium AZ31 joints in an ambient condition but also the durability in a hot-humid environment. These results suggest that PPT surface pretreatment is capable of improving the static strength and thermal durability of adhesive-bonded magnesium AZ31 sheets.


► A phosphate solution was developed to improve the strength of bonded Mg AZ31.
► The phosphate treated coating consists of KMnO4, K2HPO4, Na2SiO3 and NaF.
► NaF, Na2SiO3 and pH value in phosphate solution affect the coating quality.
► The bond strength of AZ31 Mg is as good as that of CrO3 solution treated samples.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 206, Issue 16, 15 April 2012, Pages 3517–3525
نویسندگان
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