In:
Materials and Corrosion, Wiley, Vol. 72, No. 4 ( 2021-04), p. 642-651
Abstract:
In this study, a simple pickling process in H 3 PO 4 and NH 4 HF 2 solution was used for electroless Ni–P plating on AZ61 magnesium alloy. It is found that the corrosion rate of magnesium alloy during pickling significantly decreased because NH 4 HF 2 was added into H 3 PO 4 pickling solution. Ni–P coating plated only with pickling process shows poor adhesion because of the low F/O ratio of the substrate surface. However, F/O ratio, adhesion, and corrosion resistance of Ni–P coating are obviously enhanced after pickling followed by activation. The optimal pretreatment process is pickling for 120 s and activation for 4 min, under which the Ni–P coating has an optimum F/O ratio of 1.8 and the coating gets a dense structure, better adhesion, and higher corrosion resistance.
Type of Medium:
Online Resource
ISSN:
0947-5117
,
1521-4176
DOI:
10.1002/maco.202011938
Language:
English
Publisher:
Wiley
Publication Date:
2021
detail.hit.zdb_id:
1481051-7
detail.hit.zdb_id:
1224916-6
detail.hit.zdb_id:
202688-0
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