scholarly journals Effect of Deep Cryogenic Treatment on the Microstructure and the Corrosion Resistance of AZ61 Magnesium Alloy Welded Joint

Metals ◽  
2017 ◽  
Vol 7 (5) ◽  
pp. 179 ◽  
Author(s):  
◽  
◽  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Welded Joint ◽  
Cryogenic Treatment ◽  
Deep Cryogenic Treatment ◽  
Az61 Magnesium Alloy

scholarly journals Deep Cryogenic Treatment of Metallic Materials

2020 ◽  
Author(s):  
Patricia Jovičević-Klug ◽  
Bojan Podgornik
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
Corrosion Resistance ◽  
Cryogenic Treatment ◽  
Metallic Materials ◽  
Size Change ◽  
Ferrous Alloys ◽  
Deep Cryogenic Treatment ◽  
Ferrous Metals ◽  
Proper Material

Deep cryogenic treatment (DCT) is a type of cryogenic treatment, where a metallic material is subjected to temperatures below -150°C, normally to temperatures of liquid nitrogen (-196 °C). When a material is exposed to DCT as a part of heat treatment, changes in microstructure are induced due to new grain formation, changes in grain size, change in the solubility of atoms, movement of dislocations, alteration of crystal structure, and finally new phase formation. The metallic material's performance and later performance of manufactured components and tools from this specific material are dependent on the selection of proper design, proper material, accuracy with which the tool is made and application of proper heat treatment, including any eventual DCT. Metallic materials are ferrous and non-ferrous metals. In the last years ferrous metals (different grades of steel) and non-ferrous alloys (aluminum, magnesium, titanium, nickel etc.) have been increasingly treated with DCT to alter their properties. DCT treatment has shown to reduce density of defects in crystal structure, increase wear resistance of material, increase hardness, improve toughness, and reduce tensile strength and corrosion resistance. However, some researchers also reported results showing no change in properties (toughness, hardness, corrosion resistance, etc.) or even deterioration when subjected to DCT treatment. This leads to a lack of consistency and reliability of the treatment process, which is needed for successful application in industry. This review provides a synopsis of DCT usage and resulting effects on treated materials used in automotive industry.

scholarly journals Electrochemical Impedance Analysis on Cryogenically Treated Dissimilar Metal Welding of 316L Stainless Steel and Monel 400 Alloy Using GTAW

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1088 ◽  
Author(s):  
Cherish Mani ◽  
R Karthikeyan ◽  
Sathish Kannan
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Welded Joints ◽  
Electrochemical Impedance ◽  
Cryogenic Treatment ◽  
Impedance Analysis ◽  
Oil Refining ◽  
Deep Cryogenic Treatment ◽  
Dissimilar Metal ◽  
Monel 400

An attempt was made to study the corrosion behavior of austenitic stainless-steel SS 316L/Monel 400 alloy dissimilar metal welded joints using gas tungsten arc welding. This combination of welded joints is used in re-heaters and heat exchangers in gas processing and oil refining industries. The welded specimens were subjected to post-weld treatments, such as annealing and deep cryogenic treatment. The welded specimens were sectioned into five different parts: SS 316L base, SS 316L HAZ, weld, Monel HAZ, and Monel base. The polarization method and electrochemical impedance analysis were used to analyze the corrosion resistance in a NaCl solution. A polarization graph, Nyquist plot, and Bode plot were constructed for all regions, separately, for the heat-treated and cryo-treated specimens, to analyze the variation in corrosion resistance in different regions, and then the results were compared. To validate the results of electrochemical impedance analysis, scanning electron microscope (SEM) and energy dispersive spectroscope (EDS) analyses were also performed. The results indicated that the cryo-treated specimens have better corrosion resistance when compared to the annealed ones. Weld region on both specimens exhibited better corrosion resistance when compared to other zones.

scholarly journals Improvement of bio-compatible AZ61 magnesium alloy corrosion resistance by fluoride conversion coating

2016 ◽  
Vol 60 (5) ◽  
pp. 132-138 ◽  
Author(s):  
J. Drábiková ◽  
F. Pastorek ◽  
S. Fintová ◽  
P. Doležal ◽  
J. Wasserbauer
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Simulated Body Fluid Solution ◽  
Conversion Coating ◽  
Az61 Magnesium Alloy ◽  
Wrought Magnesium Alloy ◽  
Consequent Effect ◽  
Materials Used ◽  
Short Time

Abstract Magnesium and its alloys are perspective bio-degradable materials used mainly due to their mechanical properties similar to those of mammal bones. Potential problems in utilization of magnesium alloys as bio-materials may relate to their rapid degradation which is associated with resorption problems and intensive hydrogen evolution. These problems can be eliminated by magnesium alloys surface treatment. Therefore, this work aims with analysis of the influence of fluoride conversion coating on corrosion characteristics of magnesium alloy. Unconventional technique by insertion of wrought magnesium alloy AZ61 into molten Na[BF4] salt at temperature of 450 °C at different treatment times was used for fluoride conversion coating preparation. The consequent effect of the coating on magnesium alloy corrosion was analyzed by means of linear polarization in simulated body fluid solution at 37 ± 2 °C. The obtained results prove that this method radically improve corrosion resistance of wrought AZ61magnesium alloy even in the case of short time of coating preparation.

Effects on corrosion resistance of rebar subjected to deep cryogenic treatment

2017 ◽  
Vol 31 (1) ◽  
pp. 123-132 ◽  
Author(s):  
Srinivasagam Ramesh ◽  
B. Bhuvaneswari ◽  
G. S. Palani ◽  
D. Mohan Lal ◽  
Nagesh R. Iyer
Keyword(s):  
Corrosion Resistance ◽  
Cryogenic Treatment ◽  
Deep Cryogenic Treatment

scholarly journals Conversion Coatings Produced on AZ61 Magnesium Alloy by Low-Voltage Process

2016 ◽  
Vol 61 (1) ◽  
pp. 419-424
Author(s):  
M. Nowak ◽  
B. Płonka ◽  
A. Kozik ◽  
M. Karaś ◽  
M. Mitka ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Electrochemical Method ◽  
Low Voltage ◽  
Anodic Oxide ◽  
Conversion Coatings ◽  
Anodic Current ◽  
Az61 Magnesium Alloy ◽  
Current Densities ◽  
Oxide Conversion

The resultes of anodic oxide conversion coatings on wrought AZ61 magnesium alloy production are describe. The studies were conducted in a solution containing: KOH (80 g/l) and KF (300 g/l) using anodic current densities of 3, 5 and 10 A/dm2 and different process durations. The obtained coatings were examined under a microscope and corrosion tests were performed by electrochemical method. Based on these results, it was found that the low-voltage process produces coatings conferring improved corrosion resistance to the tested magnesium alloy.

Effect of Deep Cryogenic Treatment on Wear and Corrosion Resistance of an Al–Zn–Mg–Cu Alloy

2021 ◽  
Vol 62 (1) ◽  
pp. 89-96
Author(s):  
Siyi Ma ◽  
Ruiming Su ◽  
Kaining Wang ◽  
Yuping Yang ◽  
Yingdong Qu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Cryogenic Treatment ◽  
Deep Cryogenic Treatment ◽  
Cu Alloy ◽  
Wear And Corrosion ◽  
Wear And Corrosion Resistance
Sign in / Sign up

Export Citation Format

Share Document