Abstract
To study the effect of weld and defects on the corrosion behavior of nickel aluminum bronze (UNS C95810) in 3.5% NaCl solution, the weight loss, X-ray diffraction, optical microscope, scanning electron microscope and electrochemical test of the specimen with weld and defects were investigated. The results show that the presence of weld and defects increases the corrosion rate of bronze. Weld does not change the structure of the corrosion product film, but defects induce a lack of the protective outermost corrosion product in bronze. Weld makes the corrosion product film in the early stage more porous. Defects always produce an increase in the dissolution rate of the bronze.
Highlights
IntroductionNickel–aluminum bronze (NAB) alloys containing 9–12% (wt.%) aluminum with additions of up to 6% (wt.%) of iron and nickel are among the most important groups of commercial bronze [1]
Nickel–aluminum bronze (NAB) alloys containing 9–12% aluminum with additions of up to 6% of iron and nickel are among the most important groups of commercial bronze [1].Aluminum provides higher strength and improves the corrosion resistance and castings/hot working properties [1]
Since aluminum bronzes used for ship propellers, pump, etc., are large enough, some defects are inevitably induced by casting processes
Summary
Nickel–aluminum bronze (NAB) alloys containing 9–12% (wt.%) aluminum with additions of up to 6% (wt.%) of iron and nickel are among the most important groups of commercial bronze [1]. Strength and stabilizes the microstructure while iron refines grains and enhances the alloy tensile strength [2,3]. Tang et al [13,14] applied laser surface melting and alloying for as-cast manganese nickel aluminum bronze, resulting in the refinement and homogenization of as-cast microstructure, repairing cast defects. Since the replacement of these parts with exactly the same material is very expensive, welding repair could be an economical method for the restoration of NAB parts [1] This method may lead to increased corrosion due to the occurrence of galvanic couples between the weld and base alloy. The effect of weld as well as small cast defects on the corrosion behavior of UNS C95810 will be investigated in this paper
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