Aluminum on Microstructure and Properties of As-Cast Nickel-Aluminum-Bronze Alloy AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY22030004

Chinese Library Classification Number:TG174.2

Citation Information:

Nickel aluminum bronze （NAB）alloy has been widely used in marine propellers，seawater pumps，seawater pipes，and other components because of its good mechanical properties，excellent seawater corrosion resistance，welding performance，and marine microbial adhesion inhibition. It is the core material of marine engineering. However，there are many problems such as pore defects，component segregation，and uneven structure in casting NAB alloy，which have adverse effects on its mechanical properties and corrosion resistance，resulting in various corrosion problems of parts in highly corrosive marine environment. With the marine resources development and the implementation of the strategy of marine power，marine materials need to face the environment become more complicated，at this stage for the ascension of the corrosion resistance of NAB alloy，mainly concentrated in two aspects of foundry processing and surface modification，although in the above two aspects have clear process，However，the process and product of casting processing technology have poor controllability，and the surface modification has high requirements for operation. The existing methods all have certain disadvantages. The solution is to use different alloying elements to modify the properties of alloys，which is a method to fundamentally change the structure and properties of materials，and can solve the problems existing in the traditional method. Because there is no definite scope of the influence of alloy composition on the properties of NAB alloy，with the wide application of NAB，the composition and content of alloying elements need to be adjusted according to the actual demand，so the modification method of alloying elements has good extensibility and better application prospect. NAB alloys usually contain Cu，Al，Ni，Fe，and Mn elements. At present，the research on alloying elements mainly focuses on Ni and Fe elements，and the research on Al element is too little. Therefore，based on the composition of the commonly used cast NAB alloy （ZCuAl9-4-4-2），by changing the content of Al，two NAB alloys with different Al contents were prepared. Metallographic electron microscopy （OM），scanning electron microscopy （SEM），X-ray diffraction （XRD），tensile test，Vickers hardness test，uniform corrosion，and electrochemical impedance spectroscopy were used. The microstructure，mechanical properties， and corrosion behavior of as-cast NAB alloys with different Al content in 3.5% （mass fraction）NaCl solution were studied. The influence of Al content on microstructure and phase composition of the alloys was analyzed. The mechanical properties and static corrosion properties of the NAB alloys with different Al content were studied. To explore the relationship between Al content and microstructure and properties. The internal relationship between the microstructure change caused by the change of Al content and the mechanical and corrosion properties were systematically studied. The results showed that the morphology of α phase in matrix and κ phase of intermetallic compound changed with the increase of Al content in NAB alloy，showing distinct microstructure. With the increase of Al content，the morphology of α phase in matrix and intermetallic compound κ phase changed，which promoted the precipitation of a large amount of eutectoid κⅢ phase in α phase，and the κ phase was unevenly distributed from grain boundary to grain interior. As a result，the tensile strength，yield strength，and hardness of the alloy were improved. The elongation of the alloy decreases while the content of α phase decreased. With the increase of Al content in NAB alloy，the content of α phase in matrix with good plasticity decreased，and the hard phase with good strength increased. Therefore，the tensile strength，yield strength，and hardness all showed an upward trend，while the elongation significantly decreased. The static corrosion resistance of NAB alloy could be improved significantly with the decrease of Al content. After 30 days of soaking in 3.5% NaCl solution，the weight loss of 8Al alloy was about 54% lower than that of 10Al alloy，and the corrosion rate decreased from 0.0136 to 0.0068 mm·a⁻¹. According to the results of electrochemical experiments，the corrosion resistance of the alloy was gradually improved with the increase of immersion time. After 30 days of immersion in 3.5% NaCl solution，the NAB alloy with lower Al content had higher polarization resistance and better corrosion resistance. The reduction of Al content could also reduce the local corrosion depth of NAB alloy. The surface film of Cu₂O was generated in the initial stage，and the black CuO outer layer was further oxidized with the extension of soaking time. The outer layer of basic copper chloride was generated with the extension of soaking time，and the surface film of 8Al alloy was more dense and better protective. The low corrosion resistance of NAB alloy with increased Al content was mainly due to the formation of a large amount of α+κ_Ⅲ eutectoid structure，which increased the tendency of phase selection corrosion，and the α phase was more prone to corrosion. The addition of Al significantly promoted the formation of α+κⅢ eutectoid structure，so the NAB alloy with lower Al content had higher polarization resistance and better corrosion resistance.