Abstract
This paper discusses the influence of pH value, temperature and current density on the crystalline and amorphous structure of Ni-W alloy coatings during the electroplating process. The relationship between the corrosion resistance of Ni-W alloy coating and its crystal structure is discussed. In addition, the most common types of ternary systems and composite coatings for electrodeposited Ni-W alloy coatings are introduced. The effects of element types and contents on the hardness, wear resistance, corrosion resistance and thermal stability of Ni-W alloy coatings are analyzed. Finally, the current problems and development directions of Ni-W alloy coatings are proposed.
Highlights
With the continuous development and research of alloy plating technology, there are more and more types of electrodeposited amorphous alloys, and their performance becomes more and more excellent
Zhu [3] studied the structure of Ni-W alloy coating, and the results showed that: the structure of Ni-W alloy coating changes with temperature
In order to improve the corrosion resistance of the coating, P is added to the Ni-W amorphous coating to become a NiW-P ternary alloy coating
Summary
With the continuous development and research of alloy plating technology, there are more and more types of electrodeposited amorphous alloys, and their performance becomes more and more excellent. In 1988, Omi Takashi [1] proposed the method and physical and chemical properties of electrodepositing NiW alloy, and pointed out that Ni-W amorphous coating has high hardness. It has good corrosion resistance and good demoulding performance for glass castings. Yamasaki [2] used Ni-W alloy coating prepared by electrodeposition method and found that amorphous coating will be obtained when the content of tungsten in the coating exceeds 20 %. Numerous research results show that when the content of tungsten in the alloy coating exceeds 44 %, the alloy coating has an amorphous structure [23].
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