Effect of Platinum Elements Additions on the Active Dissolution of Plastic Chromium in Sulfuric Acid

CORROSION ◽  
1984 ◽  
Vol 40 (3) ◽  
pp. 134-138 ◽  
Author(s):  
N. D. Tomashov ◽  
G. P. Chernova ◽  
E. N. Ustinsky
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Anodic Dissolution ◽  
Cathodic Polarization ◽  
Active State ◽  
Alloying Elements ◽  
Active Dissolution ◽  
Alloying Additions ◽  
Blocking Mechanism

Abstract Alloys based on plastic chromium with 0.1 to 0.4 mass % Ru, Pd, Ir, or Pt were investigated in 40% sulfuric acid in active state under cathodic polarization (−0.175 V). All of the studied additions of alloying elements are responsible for the reduced anodic dissolution of chromium. The corrosion resistance of alloys depends on the concentration and nature of the alloying additions. Two mechanisms decelerating the active dissolution of the cathode-modified chromium have been established, i.e., blocking mechanism (cathodic component atoms block the active points in the lattice) and screening mechanism (cathodic component, while getting crystallized on the surface, partly screens the latter).

Rapid screening alloying elements for improved corrosion resistance on the Mg (0001) surface using first principles calculations

2021 ◽  
Author(s):  
Chi Zhang ◽  
Junsheng Wang ◽  
Xin Li ◽  
Shuo Wang ◽  
Shijie Zhu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Anodic Dissolution ◽  
First Principles ◽  
Mg Alloys ◽  
Alloying Elements ◽  
Rapid Screening ◽  
First Principles Calculations ◽  
The Poor

The poor corrosion resistance of Mg alloys is a major challenge for their applications. The corrosion of Mg alloys is mainly controlled by the anodic dissolution of Mg and the...

ALCOTEC WELD FILLER WIRE 5356

Alloy Digest ◽  
2016 ◽  
Vol 65 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Alloying Elements ◽  
Filler Wire ◽  
Welding Wire

Abstract Alcotec weld filler wire 5356 is a non-heat-treatable aluminum welding wire whose principal alloying elements are magnesium, manganese, and chromium. It is similar to the European wire AlMg5Cr(A). This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on corrosion resistance as well as forming and joining. Filing Code: Al-445. Producer or source: AlcoTec Wire Corporation.

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.

ALLEGHENY LUDLUM AL-6XN PLUS

Alloy Digest ◽  
2005 ◽  
Vol 54 (6) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Alloying Elements ◽  
Temperature Performance

Abstract The AL-6XN PLUS alloy is an enhanced version of the AL-6XN alloy (see Alloy Digest SS-494, May 1988). Both satisfy the composition requirements of UNS N08367, but AL-6XN PLUS contains a greater concentration of the alloying elements (Cr, Mo, and N) which promote corrosion resistance. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as heat treating and joining. Filing Code: SS-923. Producer or source: Allegheny Ludlum Corporation. Originally published April 2005, revised June 2005.

DMV 928

Alloy Digest ◽  
2009 ◽  
Vol 58 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Base Alloy ◽  
Heat Treating ◽  
Alloying Elements ◽  
Nickel Base Alloy ◽  
Excellent Corrosion Resistance ◽  
Nickel Base

Abstract DMV 928 is a nickel-base alloy with high alloying elements of chromium, molybdenum, and copper for excellent corrosion resistance in reducing and oxidizing media. This datasheet provides information on composition, physical properties, 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: SS-1048. Producer or source: Mannesmann DMV Stainless USA Inc.

Comparison of corrosion resistance properties of Ni-P and Ni-W-P coatings obtained by electroless deposition

2020 ◽  
Vol 25 (2) ◽  
pp. 66-71
Author(s):  
A.B. Drovosekov
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Electroless Deposition ◽  
Corrosion Damage ◽  
Electrochemical Activity ◽  
High Porosity ◽  
Environment Analysis ◽  
Damage Degree ◽  
Lower Porosity ◽  
Electroless Coatings

Corrosion resistance properties, such as porosity, stability in the atmosphere of NaCl mist, and anodic electrochemical activity in a sulfuric acid solution are studied and compared for Ni-W-P and Ni-P coatings obtained by electroless deposition. The studied coatings were obtained from solutions with glycine as the main ligand and contained 10.2 to 15.6 at.% of phosphorus and up to 3.3 at.% of tungsten. It is shown that Ni-W-P coatings with a tungsten content of 2.3 to 3.3 at.% and a thickness of 15 μm have a significantly lower porosity as compared with nickel-phosphorus coatings of the same thickness. Also, significantly better stability of Ni-W-P coatings in a NaCl mist atmosphere was observed, their corrosion damage degree is less than that of Ni-P coatings, and relatively little depends on the duration of exposure in a corrosive environment. Analysis of anodic polarization curves showed an almost similar electrochemical activity upon dissolution of Ni-P and Ni-W-P coatings in sulfuric acid. Both these types of electroless coatings showed a markedly better tendency to anodic dissolution than pure nickel. Taking into account the obtained experimental data, a conclusion is made as to the better protective characteristics of Ni-W-P coatings in comparison with nickel-phosphorus coatings. The main reason of the inferior protective properties of Ni-P coatings is their relatively high porosity.

Effects of the Duration of Potentiostatic Anodizing on the Corrosion Resistance and Surface Morphology of Films Formed on Mg-Al Alloys

2005 ◽  
Vol 486-487 ◽  
pp. 125-128 ◽  
Author(s):  
Seong Jong Kim ◽  
Seok Ki Jang ◽  
Jeong Il Kim
Keyword(s):  
Corrosion Resistance ◽  
Surface Morphology ◽  
Anodic Oxide ◽  
Al Alloys ◽  
Anodic Film ◽  
Al Alloy ◽  
Active Dissolution ◽  
Dissolution Reaction ◽  
Alloy Az91 ◽  
Morphology Of Films

The effects of the duration of potentiostatic anodizing on the corrosion resistance and surface morphology of anodic oxide films formed on Mg-Al alloy (AZ91) in 1 M NaOH were investigated. With the formation of an anodic film, the current density decreased gradually, started to stabilize at 300 s, and was relatively constant at 600 s. These results may be related to the increased time for catalysis of the active dissolution reaction, which not only enlarges the area covered by the anodic film, but also produces a more coherent, thicker film. The reference corrosion potentials of the anodic oxide film for AZ91 shifted in the noble direction with time. In general, the corrosion resistance characteristics were improved with anodizing time.

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