The mechanical properties and corrosion behavior of as-cast, as-annealed and hot-rolled nickel-aluminum bronze (NAB) alloy (Cu-9Al-10Ni-4Fe-1.2 Mn, all in wt.%) in 3.5 wt.% NaCl solution were investigated. The results show that annealing introduces a large number of κ phases to precipitate in the α phase. However, after further hot rolling, the original continuous κ phases are spheroidized and dispersed, increasing the strength, hardness, and elongation of the alloy. In addition to the enhanced mechanical properties, the corrosion resistance of the NAB samples is also improved significantly by hot rolling, as revealed by the mass loss measurements, electrochemical impedance spectroscopy (EIS), and cross-sectional corrosion morphology. Selective phase corrosion occurs by the preferential corrosion of the α phase, which acts as an anode to the κ phases, and the uncorroded κ phases are retained in the corrosion product film. The interfaces between the κ phases and the surrounding corrosion products become discontinuous caused by the spheroidization of κ phases, reducing the corrosion of the substrate by the corrosive medium via the channels. As a result, the corrosion rate and the maximum local corrosion depth of the hot-rolled NAB sample are greatly reduced.

铸造，退火和热轧镍铝青铜（NAB）合金（Cu-9Al-10Ni-4Fe-1.2 Mn，全部以重量％计）在3.5 wt。％NaCl中的机械性能和腐蚀行为解决方案进行了调查。结果表明，退火引入了大量的κ相以沉淀在α相中。但是，在进一步热轧后，原始的连续κ相被球化和分散，从而增加了合金的强度，硬度和伸长率。除了增强的机械性能，通过质量损失测量，电化学阻抗谱（EIS）和横截面腐蚀形态，还可以通过热轧显着提高NAB样品的耐腐蚀性。选择性相腐蚀是由于α相的优先腐蚀而发生的，它作为κ相的阳极，未腐蚀的κ相保留在腐蚀产物膜中。κ相和周围腐蚀产物之间的界面由于κ相的球化作用而变得不连续，从而减少了腐蚀性介质通过通道对基材的腐蚀。结果，大大降低了热轧NAB样品的腐蚀速率和最大局部腐蚀深度。