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Abstract
The corrosion behavior of duplex Ni-P coatings deposited on AZ91 magnesium alloy was studied. The electroless deposition process of duplex Ni-P coating consisted in the preparation of low-phosphorus Ni-P coating (5.7 wt.% of P), which served as a bond coating and high-phosphorus Ni-P coating (11.5 wt.% of P) deposited on it. The duplex Ni-P coatings with the thickness of 25, 50, 75 and 100 µm were deposited on AZ91 magnesium alloy. The electrochemical corrosion behavior of coated AZ91 magnesium alloy was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization method in 0.1 M NaCl. Obtained results showed a significant improvement in the corrosion resistance of coated specimens when compared to uncoated AZ91 magnesium alloy. From the results of the immersion tests in 3.5 wt.% NaCl, 10% solution of HCl and NaOH and 5% neutral salt spray, a noticeable increase in the corrosion resistance with the increasing thickness of the Ni-P coating was observed.
Highlights
Due to low weight, magnesium and its alloys show great potential in the field of automotive, aerospace, and electrochemical applications [1,2,3]
The aim of this paper is the study of the corrosion resistance of duplex Ni-P coatings deposited on AZ91 magnesium alloy
The study of the corrosion resistance of duplex Ni-P coating deposited on AZ91 magnesium alloy was performed in various environments
Summary
Magnesium and its alloys show great potential in the field of automotive, aerospace, and electrochemical applications [1,2,3]. Magnesium alloys have low density, high modulus, good strength to weight ratio and physical properties [4]. Their use is limited because of low corrosion resistance and poor wear properties. The electrochemical treatment of magnesium alloy surface is difficult due to their high chemical affinity to acid aqueous solutions [5]. On the other hand, performed surface treatment, which can improve the corrosion and wear resistance of magnesium alloys, is very important for many applications. The electroless conversion or thermally sprayed coatings, organic or ceramic coatings, varnishes are appropriate representatives to improve
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