The Effect of Phosphorous on the Corrosion Resistance of Glassy Copper Zirconium Alloys

1983 ◽  
Vol 28 ◽  
Author(s):  
T.D. Burleigh ◽  
R.M. Latanision
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Corrosion Rate ◽  
Zirconium Alloys ◽  
Amorphous Structure ◽  
Metal Alloys ◽  
Crystalline Defects ◽  
Zirconia Film ◽  
Melt Spun ◽  
Semiconductor Properties

ABSTRACTPhosphorous has been shown to have a beneficial effect on reducing the corrosion rate of various metal alloys. This research was undertaken to determine by what mechanism the phosphorous is able to improve the corrosion resistance of metals. The amorphous copper-zirconium system was chosen for experimentation because the amorphous structure eliminates the complications due to crystalline defects. The zirconium forms zirconia (ZrO2), which is normally a protective surface oxide. Copper-zirconium alloys with and without phosphorous were melt-spun, and were tested in various electrolytes. In comparing Cu-42Zr-2P with Cu-4OZr, the results show that the corrosion rate of Cu-42Zr-2P is lower in 1N sulfuric acid, and significantly lower in 3.5 w/o NaCl, and in 1N HCl. ESCA analysis shows that phosphorous is present in the zirconia film, and has a valence of +5. Photocurrent experiments suggest that phosphorous alters the semiconductor properties of the zirconia film.

scholarly journals Effect of Heat Treatment and Sulfuric Acid Anodization on Corrosion Resistance of Aluminum Alloy (AA7075)

2021 ◽  
Vol 40 (1) ◽  
pp. 56-62
Author(s):  
M. Abdullahi ◽  
L.S. Kuburi ◽  
P.T. Zubairu ◽  
U. Jabo ◽  
A.A. Yahaya ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Sulfuric Acid ◽  
Corrosion Rate ◽  
Polarization Resistance ◽  
Testing Machine ◽  
Palm Kernel ◽  
Engine Oil ◽  
Micro Hardness

This paper, studied the effect of heat treatment and anodization on corrosion resistance of aluminum alloy 7075 (AA7075), with a view to improving its corrosion resistance. Microstructure and micro hardness of the anodic film of the samples were studied with the aid of optical metallurgical microscope and automated micro hardness testing machine. Linear polarization methods were used to assess the corrosion behaviour of the alloy in 0.5M HCl. The microstructure of the annealed sample showed formation of dendrites while precipitation hardened samples in palm kernel oil and SAE 40 engine oil showed precipitates of MgZn2. The SEMS result showed pores and micro cracks on the surfaces of the anodized samples, with the as cast and anodized sample in sulfuric acid exhibiting most compact with few pores. The as cast and sulfuric acid anodized sample shows highest micro hardness value of 205.33 HV, while the least value of 150.67 HV was recorded in sample precipitation hardened in SAE 40 engine oil and anodized in sulfuric acid. Analysis of the potentiodynamic polarization data and curves showed a linear relationship (decrease in icorr, decreases the corrosion rate) between current density and the corrosion rate in all the samples. Higher polarization resistance of 15.093 Ω/cm2 was recorded by the as cast and Sulfuric acid (SA) anodized sample while the precipitation treated in SAE 40 engine oil plus SA anodized sample recorded lowest polarization resistance of 5.2311 Ω/cm2. Heat treatment alone improves corrosion resistance of AA 7075 in 0.5 M HCl solution but heat treatment plus SA anodization does not improve corrosion resistance in the same environment.

The Corrosion Resistance of Alloys to Salt Brine Attack

1983 ◽  
Vol 26 ◽  
Author(s):  
V. Mirschinka ◽  
R. Odoj
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Stress Corrosion ◽  
Rupture Strength ◽  
High Surface ◽  
Metal Alloys ◽  
Creep Rupture Strength ◽  
Corrosion Attack ◽  
Surface Corrosion ◽  
Salt Brine

ABSTRACTSix metal alloys were subjected to surface and creeprupture stress corrosion tests using NaCl- and Q-brines. Low-allou materials do not seem to be suitable as a barrier against salt brine attack due to the high surface corrosion rate. Creep-rupture strength corrosion was insignificant for the tested materials. Hastelloy C 4 showed no corrosion attack by salt brines in autoclaves at 200°C and 100 bar during 8 months of testing. Bentonite was shown to reduce the corrosion attack considerably.

Superheated Steam Of Zirconium Alloys Containing Small Amounts Of Iron and Copper or Nickel

CORROSION ◽  
1965 ◽  
Vol 21 (4) ◽  
pp. 113-124 ◽  
Author(s):  
S. GREENBERG ◽  
C. A. YOUNGDAHL
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Corrosion Product ◽  
Flow Rate ◽  
Superheated Steam ◽  
Zirconium Alloys ◽  
Oxygen Absorption ◽  
Exposure Temperature ◽  
Hydrogen Mixtures

Abstract Alloys of zirconium containing small amounts of iron and copper or nickel have corrosion resistance in superheated steam superior to that of the Zircaloys. At 540 C (1004 F) and 600 psi lowest rates are about 4 mdd (2.4 mpy) and at 650 C (1202 F) and 600 psi rates are about 6.8 mdd (4.1 mpy). High initial rates lead to an extrapolated intercept of about 4 mg/sq cm at 650 C (1202 F). The thickening films are subject to cracking at sharp radii. Absorption of corrosion product hydrogen decreases markedly as exposure temperature is raised from 540 to 650 C (1004 to 1202 F). This phenomenon is not understood. Metal embrittlement due to oxygen absorption becomes an increasingly serious problem as temperature is raised. Corrosion rate at 650 C (1202 F) is not affected by flow rate (300 ft/sec) or by presence of oxygen or oxygen-hydrogen mixtures in the steam.

Study on the Corrosion Resistance of Ti(CN) Composites Coating

2013 ◽  
Vol 341-342 ◽  
pp. 88-91
Author(s):  
Dan Dan Li ◽  
Jian Jun Hao ◽  
Yue Jin Ma ◽  
Liang Gao ◽  
Jian Guo Zhao
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Sodium Chloride ◽  
Low Temperature ◽  
Corrosion Rate ◽  
Steel Substrate ◽  
Polarization Measurement ◽  
Mass Ratio ◽  
Metal Composites ◽  
Butyl Phthalate

Metal composites coating of Ti (CN) was made on the surface of Q235 steel substrate by reaction nitrogen are welding cladding process, and potted with low temperature epoxy, di-n-butyl phthalate and T31, the mass ratio was 10:2:1.5. To evaluate the corrosion resistance of Ti (CN) coating, the specimens were immersed in 5% sulfuric acid and 3.5% sodium chloride to calculate corrosion rate by potentiodynamic polarization measurement. The corrosion resistance of Ti (CN) is improved by 3.45 times in 5% sulfuric acid and 4.39 times in3.5% sodium chloride.

Phosphate Conversion Coating on Diecast AZ91D and Its Corrosion Resistance

2005 ◽  
Vol 488-489 ◽  
pp. 819-822 ◽  
Author(s):  
Wan Qiu Zhou ◽  
Da Yong Shan ◽  
En Hou Han ◽  
Wei Ke
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Magnesium Alloys ◽  
Polarization Curve ◽  
Immersion Test ◽  
Amorphous Structure ◽  
Conversion Coating ◽  
Test Results ◽  
Complex Phosphate

A phosphate conversion coating was deposited on diecast AZ91D magnesium alloys, the film was a complex phosphate containing Mg and Al,which showed amorphous structure. Corrosion resistance of conversion coating in 3.5%NaCl was investigated by polarization curve. It was showed that the anodic branch of polarization curve for the phosphate conversion coating presented typical passivation characteristic. Immersion test results showed that the corrosion rate of phosphate conversion coating was less than that of chromate Dow7 film.

Spherulite Structures in a Melt Spun Fe-Ni Austenitic Steel

1985 ◽  
Vol 43 ◽  
pp. 52-53
Author(s):  
G. M. Michal ◽  
T. K. Glasgow ◽  
T. J. Moore
Keyword(s):  
Austenitic Steel ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Large Range ◽  
Amorphous Structure ◽  
Nucleation And Growth ◽  
Ni Alloys ◽  
Melt Spun ◽  
Crystal Fibers ◽  
Rapidly Solidified

Large additions of B to Fe-Ni alloys can lead to the formation of an amorphous structure, if the alloy is rapidly cooled from the liquid state to room temperature. Isothermal aging of such structures at elevated temperatures causes crystallization to occur. Commonly such crystallization pro ceeds by the nucleation and growth of spherulites which are spherical crystalline bodies of radiating crystal fibers. Spherulite features were found in the present study in a rapidly solidified alloy that was fully crysstalline as-cast. This alloy was part of a program to develop an austenitic steel for elevated temperature applications by strengthening it with TiB2. The alloy contained a relatively large percentage of B, not to induce an amorphous structure, but only as a consequence of trying to obtain a large volume fracture of TiB2 in the completely processed alloy. The observation of spherulitic features in this alloy is described herein. Utilization of the large range of useful magnifications obtainable in a modern TEM, when a suitably thinned foil is available, was a key element in this analysis.

REVERE No. 430

Alloy Digest ◽  
1958 ◽  
Vol 7 (5) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
High Temperature ◽  
Physical Properties ◽  
High Resistance ◽  
High Strength ◽  
Heat Treating ◽  
Aluminum Bronze ◽  
Temperature Performance ◽  
Excellent Corrosion Resistance

Abstract REVERE No. 430 is an aluminum bronze having high strength, excellent corrosion resistance, and high resistance to sulfuric acid. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-63. Producer or source: Revere Copper and Brass Inc..

HASTELLOY ALLOY D

Alloy Digest ◽  
1956 ◽  
Vol 5 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Physical Properties ◽  
Tensile Properties ◽  
Boiling Point ◽  
Cast Alloy ◽  
Heat Treating

Abstract HASTELLOY ALLOY-D is a cast alloy composed primarily of nickel and silicon, and is exceptionally resistant to sulfuric acid of all concentrations even up to the boiling point. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-29. Producer or source: Haynes Stellite Company.

TIMETAL 35A

Alloy Digest ◽  
2001 ◽  
Vol 50 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
High Temperature ◽  
Nitric Acid ◽  
Physical Properties ◽  
Chlorine Dioxide ◽  
Heat Treating ◽  
Bend Strength ◽  
Temperature Performance ◽  
Sodium And Potassium

Abstract Titanium shows outstanding resistance to seawater and marine atmospheres. It is also resistant to attack by hot metallic chloride solutions, sodium and potassium hypochlorite, and chlorine dioxide. The metal is resistant to attack by hot nitric acid at concentrations up to 80% and is not attacked by sulfuric acid. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and bend strength as well as fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: TI-122. Producer or source: Timet.

COOPER ALLOY 22W

Alloy Digest ◽  
1963 ◽  
Vol 12 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Creep Rate ◽  
Corrosion Rate ◽  
Physical Properties ◽  
High Strength ◽  
Heat Treating ◽  
Casting Alloy ◽  
Hot Gas ◽  
Gas Corrosion ◽  
Very High

Abstract Cooper Alloy 22W is a high strength, heat resistant casting alloy with a low creep rate. It is recommended for heat applications where stress and hot gas corrosion rate are very high. 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, joining, and surface treatment. Filing Code: SS-146. Producer or source: Cooper Alloy Corporation.

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