scholarly journals Process Selection for the Fabrication of Cavitation Erosion-Resistant Bronze Coatings by Thermal and Kinetic Spraying in Maritime Applications

2021 ◽  
Author(s):  
Michél Hauer ◽  
Frank Gärtner ◽  
Sebastian Krebs ◽  
Thomas Klassen ◽  
Makoto Watanabe ◽  
...  
Keyword(s):  
Service Life ◽  
Cold Spraying ◽  
Arc Spraying ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Process Selection ◽  
Hvof Spraying ◽  
Warm Spraying ◽  
The Right ◽  
Nickel Aluminum Bronze

AbstractThe present study compares prerequisites for cavitation-resistant bronzes production by different coating techniques, namely cold spraying, HVOF spraying, warm spraying and arc spraying. If optimized to maximum cavitation resistance, the deposited coatings can increase the service life of ship rudders significantly. Furthermore, these methods could enable repair processes for ship propellers. This study is meant to help selecting the right coating technology to achieve best cavitation protection for a given set of requirements. Using high-pressure warm spraying and cold spraying, properties similar to those of cast nickel aluminum bronze are achieved. Also, coatings produced by using HVOF and arc spraying have erosion rates that are only about four, respectively, three times higher as compared to cast nickel aluminum bronze, while by far outperforming bulk shipbuilding steel. Their properties should be sufficient for longer service life, i.e., less docking events for ship rudder repair. Hence, with respect to costs, HVOF and arc spraying could represent a good compromise to reach the specified coating properties needed in application, potentially even for propeller repair.

Fabrication of Cavitation Erosion Resistant Bronze Coatings by Thermal and Kinetic Spraying for Maritime Applications

2021 ◽  
Author(s):  
M. Hauer ◽  
F. Gärtner ◽  
S. Krebs ◽  
T. Klassen ◽  
M. Watanabe ◽  
...  
Keyword(s):  
Service Life ◽  
Cold Spraying ◽  
Arc Spraying ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Coating Properties ◽  
Hvof Spraying ◽  
Warm Spraying ◽  
Erosion Rates ◽  
Nickel Aluminum Bronze

Abstract The present study compares needed prerequisites for the application of cavitation resistant bronzes by applying different coating techniques, such as cold spraying, HVOF spraying, warm spraying and arc spraying. By optimization to optimum cavitation resistance, the deposited coatings can increase the service life of ship rudders significantly and even serve as repair processes for ship propellers. The given overview aims to support the selection of processes when specifying the target properties to be set with regard to cavitation protection. By using high-pressure warm spraying and cold spraying, properties similar to those of cast nickel aluminum bronze were achieved, however at relatively high costs. In contrast, coatings produced by using HVOF and arc spraying have erosion rates that are only about four respectively three times higher as compared to cast nickel aluminum bronze, while far outperforming bulk shipbuilding steel. Hence, their properties should be sufficient for acceptable service life or docking intervals for ship rudder applications. Propeller repair might demand for better coating properties as obtained by cold spraying. With respect to costs, HVOF and arc spraying in summary might represent a good compromise to reach coating properties needed in application.

Investigation of nickel coatings obtained by laser processing on the surface of bronze

2021 ◽  
pp. 105-112
Author(s):  
E. Yu. Gerashchenkova ◽  
D. A. Gerashchenkov ◽  
A. N. Belyakov
Keyword(s):  
Laser Processing ◽  
Cold Spraying ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Second Stage ◽  
Nickel Coatings ◽  
Nickel Powders ◽  
Processing Modes ◽  
Two Stages ◽  
Nickel Aluminum Bronze

The article presents the results of a comprehensive study of the modes of laser processing during the formation of a coating on nickel-aluminum bronze using nickel powders. The coating was obtained in two stages. At the first stage, a precursor coating of the powder material was applied by cold spraying, at the second stage, its surface treatment with a laser was performed. The change in the composition and properties of the coating is shown depending on the processing modes and the thickness of the precursor coating, as well as the modes of laser processing.

Laser freeforming of nickel-aluminum bronze

1999 ◽  
Author(s):  
Kenneth C. Meinert ◽  
Eric J. Whitney
Keyword(s):  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Nickel Aluminum Bronze

CONCAST AMS 4880-C95510

Alloy Digest ◽  
2019 ◽  
Vol 68 (9) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Metal Products ◽  
Nickel Aluminum Bronze ◽  
Bronze Casting

Abstract AMS 4880-C95510 is a nickel-aluminum bronze casting useful for bushings and bearings. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on machining. Filing Code: Cu-895. Producer or source: Concast Metal Products Company.

AUR-O-MET 57

Alloy Digest ◽  
1956 ◽  
Vol 5 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
Tensile Properties ◽  
Abrasion Resistance ◽  
Heat Treating ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
High Nickel ◽  
Nickel Aluminum Bronze

Abstract AUR-O-MET 57 is a high nickel-aluminum bronze that was developed primarily for its abrasion resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on heat treating, machining, and joining. Filing Code: Cu-42. Producer or source: Aurora Metal Company.

PROMET 115N

Alloy Digest ◽  
1967 ◽  
Vol 16 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Corrosion Resistant ◽  
Nickel Aluminum Bronze

Abstract PROMET-115N is a heat treatable nickel-aluminum bronze recommended for corrosion resistant, high strength bearings, gears and castings. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Cu-175. Producer or source: American Crucible Products Company.

scholarly journals Effect of Fluid Flow on the Corrosion Performance of as-Cast and Heat-Treated Nickel Aluminum Bronze Alloy (UNS C95800) in Saline Solution

2021 ◽  
Vol 2 (1) ◽  
pp. 61-77
Author(s):  
Hamid Reza Jafari ◽  
Ali Davoodi ◽  
Saman Hosseinpour
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Flow Rate ◽  
Solution Temperature ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Nacl Solution ◽  
Flow Conditions ◽  
Heat Treated ◽  
Nickel Aluminum Bronze

In this work, the corrosion behavior and surface reactivity of as-cast and heat-treated nickel aluminum bronze casting alloy (UNS C95800) in 3.5 wt% NaCl solution is investigated under stagnant and flow conditions. Increasing flow rate conditions are simulated using a rotating disk electrode from 0 to 9000 revolutions per minute (rpm). Optical micrographs confirm the decrease in the phase fraction of corrosion-sensitive β phase in the microstructure of C95800 after annealing, which, in turn, enhances the corrosion resistance of the alloy. Electrochemical studies including open circuit potentiometry, potentiodynamic polarization, and electrochemical impedance spectroscopy are performed to assess the effect of flow rate and heat treatment on the corrosion of samples at 25 and 40 °C in 3.5 wt% NaCl solution. For both as-cast and heat-treated samples, increasing the flow rate (i.e., electrode rotating rate) linearly reduces the corrosion resistance, indicating that the metal dissolution rate is significantly affected by hydrodynamic flow. Increasing the solution temperature negatively impacts the corrosion behavior of the as-cast and heat-treated samples at all flow conditions.

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