scholarly journals The Importance of Phase Composition for Corrosion Resistance of Borided Layers Produced on Nickel Alloys

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5131
Author(s):  
Natalia Makuch
Keyword(s):  
Corrosion Resistance ◽  
Phase Composition ◽  
Nickel Alloys ◽  
Chromium Content ◽  
Pure Nickel ◽  
High Susceptibility ◽  
Nickel Chromium ◽  
Chromium Alloys ◽  
Plasma Paste Boriding ◽  
Boriding Process

The plasma paste boriding process was used for production of the borided layers on pure nickel and nickel-chromium alloys. The produced layers consisted of nickel borides only (in the case of nickel) or a nickel and chromium borides mixture (in the case Ni–Cr alloys). The objective of this investigation was to indicate the importance of the presence of chromium for corrosion resistance of non-borided alloys, as well as to indicate the influence of phase composition of borided layers on their corrosion resistance. Pure nickel was characterized by higher corrosion resistance, in comparison to the nickel-based alloys. Increased chromium content in nickel alloys resulted in their high susceptibility for pitting corrosion. All borided samples were characterized by higher corrosion resistance than the non-borided samples. However, the phase composition of borided layers influenced their corrosion resistance. Due to the microstructure which consisted of one type of borides (nickel borides), borided nickel had the highest resistance to corrosion, whereas the presence of chromium borides in layers produced on nickel-chromium alloys caused a decrease in corrosion resistance.

HREM observation of NiO growth on submicron spheres of pure nickel

1989 ◽  
Vol 47 ◽  
pp. 548-549
Author(s):  
C.M. Teng ◽  
T.F. Kelly ◽  
J.P. Zhang ◽  
H.M. Lin ◽  
Y.W. Kim
Keyword(s):  
Nickel Oxide ◽  
Grain Boundaries ◽  
Pure Nickel ◽  
Submicron Particles ◽  
Crystal Formation ◽  
Nickel Wire ◽  
Liquid Droplets ◽  
Oxide Interface ◽  
Nickel Chromium ◽  
Chromium Alloys

Spherical submicron particles of materials produced by electrohydrodynamic (EHD) atomization have been used to study a variety of materials processes including nucleation of alternative crystallization phases in iron-nickel and nickel-chromium alloys, amorphous solidification in submicron droplets of pure metals, and quasi-crystal formation in nickel-chromium alloys. Some experiments on pure nickel, nickel oxide single crystals, the nickel/nickel(II) oxide interface, and grain boundaries in nickel monoxide have been performed by STEM. For these latter studies, HREM is the most direct approach to obtain particle crystal structures at the atomic level. Grain boundaries in nickel oxide have also been investigated by HREM. In this paper, we present preliminary results of HREM observations of NiO growth on submicron spheres of pure nickel.Small particles of pure nickel were prepared by EHD atomization. For the study of pure nickel, 0.5 mm diameter pure nickel wire (99.9975%) is sprayed directly in the EHD process. The liquid droplets solidify in free-flight through a vacuum chamber operated at about 10-7 torr.

NICROFER 6030

Alloy Digest ◽  
1996 ◽  
Vol 45 (7) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Chromium Content ◽  
Iron Alloy ◽  
Heat Treating ◽  
High Chromium ◽  
Nickel Chromium ◽  
Alloy 690 ◽  
Nuclear Systems

Abstract Nicrofer 6030 (alloy 690) is a nickel-chromium-iron-alloy with high chromium content (30%) to resist both oxidizing environments and primary and secondary water in PWR nuclear systems. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-513. Producer or source: VDM Technologies Corporation.

Effect of Aluminising on the Hot Corrosion Resistance of Nickel-Chromium Alloys

2006 ◽  
Vol 514-516 ◽  
pp. 505-509 ◽  
Author(s):  
César A.C. Sequeira ◽  
Fernand D.S. Marquis
Keyword(s):  
Corrosion Resistance ◽  
Molten Salt ◽  
Hot Corrosion ◽  
Xrd Analysis ◽  
Weight Percent ◽  
Test Results ◽  
Nickel Chromium ◽  
Chromium Alloys ◽  
Nial Phase ◽  
Cyclic Corrosion

The effects of aluminising on the hot corrosion resistance of two nickel-chromium alloys containing 10 and 30 weight percent chromium, respectively, were examined. The Ni/Cr specimens were aluminised by pack cementation in Ar and underwent cyclic hot corrosion testing in Na2SO4- NaCl molten salt. XRD analysis indicated that a NiAl phase formed between the coating layer and substrate. Cyclic hot corrosion test results indicated that the effects of aluminising are more pronounced in the case of the 10 % Cr than in the case of 30 % Cr. The ductile NiAl phase suppressed the potential for crack initiation during thermal cycling of the 10 % Cr specimens, and reinforced the hot cyclic corrosion resistance in molten salt for the 30 % Cr specimens.

ALCHROME ALLOY 750

Alloy Digest ◽  
1988 ◽  
Vol 37 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Aluminum Resistance ◽  
Nickel Chromium ◽  
Chromium Alloys ◽  
Resistance Alloy ◽  
Iron Chromium

Abstract ALCHROME ALLOY 750 is an iron-chromium-aluminum resistance alloy operable at temperatures up to 1900 F (1038 C). It is usually used in medium-to-heavy wire sizes. Because of its higher resistivity than nickel-chromium alloys it is often specified where space is a factor. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on corrosion resistance. Filing Code: Fe-87. Producer or source: Carpenter.

Quasicrystal structures in submicron spheres of pure nickel and nickel-chromium alloys

1989 ◽  
Vol 47 ◽  
pp. 296-297
Author(s):  
Hong-Ming Lin ◽  
Thomas F. Kelly
Keyword(s):  
Intermediate State ◽  
Pure Nickel ◽  
Icosahedral Quasicrystal ◽  
Diffraction Ring ◽  
Rotation Symmetry ◽  
Nickel Chromium ◽  
Chromium Alloys ◽  
Fe Alloys ◽  
Crystal Grains ◽  
Diffraction Patterns

The icosahedral quasicrystal with a fivefold rotation symmetry was first reported in Al-M (M = Cr, Mn, Fe) alloys. Later, quasicrystals with eightfold, tenfold, and twelvefold rotation symmetries were also reported. A twelvefold symmetry has been found in a Ni-70.6 at%Cr alloy and an eightfold symmetry has been found in a Cr-Ni-Si alloy. This indicates a potential for nickel-chromium alloys to form the quasicrystal phase.An intermediate state between crystalline and quasicrystalline states is also discussed by Li, Teng, et. al. in an Al-Cu-Mg alloy due to the coexistence of micro-quasicrystal and micro-crystal grains. When regions larger than 1 nm are measured, a coherent boundary is found between micro-quasicrystal and micro-crystal grains.A diffraction pattern with seemingly twelvefold symmetry is found in pure nickel and Ni-20at%Cr sphere of about 25 nm diameter as shown in Figure 1. The diffraction patterns do not have true twelvefold symmetry but the first diffraction ring is found to have twelve diffracted spots. Similar structures are found in Ni-10at%Cr and shown in Figure 2 with a series of diffraction patterns.

Bond strength of adhesive resin to three nickel-chromium alloys with varying chromium content

1994 ◽  
Vol 72 (6) ◽  
pp. 582-584 ◽  
Author(s):  
Johnny P. Salonga ◽  
Hideo Matsumura ◽  
Katsuhiro Yasuda ◽  
Yoshihisa Yamabe
Keyword(s):  
Bond Strength ◽  
Chromium Content ◽  
Adhesive Resin ◽  
Nickel Chromium ◽  
Chromium Alloys

UNS N06455

Alloy Digest ◽  
1989 ◽  
Vol 38 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Stress Corrosion Cracking ◽  
Temperature Stability ◽  
Heat Treating ◽  
High Ductility ◽  
High Temperature Stability ◽  
Nickel Chromium ◽  
Long Time ◽  
Resistance To Stress

Abstract UNS NO6455 is a nickel-chromium-molybdenum alloy with outstanding high-temperature stability as shown by high ductility and corrosion resistance even after long-time aging in the range 1200-1900 F. The alloy also has excellent resistance to stress-corrosion cracking and to oxidizing atmospheres up to 1900 F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-367. Producer or source: Nickel and nickel alloy producers.

INCO ALLOY G-3

Alloy Digest ◽  
1986 ◽  
Vol 35 (10) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Heat Affected Zone ◽  
Iron Alloy ◽  
Heat Treating ◽  
Minor Elements ◽  
Nickel Chromium ◽  
Inco Alloy

Abstract INCO Alloy G-3 is a nickel-chromium-iron alloy with additions of molybdenum and copper. Some of the minor elements are controlled to provide increased resistance to weld heat-affected zone corrosion. The alloy has exceptional stress-corrosion cracking resistance in chloride-containing environments. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-341. Producer or source: lnco Alloys International.

NICROFER 5716 HMoW

Alloy Digest ◽  
1985 ◽  
Vol 34 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Tensile Properties ◽  
Stress Corrosion Cracking ◽  
Crevice Corrosion ◽  
Corrosion Cracking ◽  
Low Carbon ◽  
Nickel Chromium ◽  
Corrosion Pitting

Abstract NICROFER 5716 HMoW is a nickel-chromium-molybdenum alloy with tungsten and extremely low carbon and silicon contents. It has excellent resistance to crevice corrosion, pitting and stress-corrosion cracking. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, machining, and joining. Filing Code: Ni-324. Producer or source: Vereingte Deutsche Metallwerke AG.

Sign in / Sign up

Export Citation Format

Share Document