Optical Properties and Corrosion Resistance of Durable Silver Coatings

1998 ◽  
Vol 555 ◽  
Author(s):  
P. D. Fuqua ◽  
J. D. Barrie
Keyword(s):  
Corrosion Resistance ◽  
Silicon Nitride ◽  
Electrochemical Impedance ◽  
Thin Layers ◽  
Harsh Environments ◽  
Silver Coating ◽  
Atmospheric Gases ◽  
Adhesion Layer ◽  
Excellent Corrosion Resistance ◽  
Sputter Deposited

AbstractThere is a need in the optics community for highly reflective mirrors that do not degrade in harsh environments. While silver can be a highly efficient reflector of visible light, it suffers from poor resistance to corrosive atmospheric gases. Here, we investigate a durable silver coating scheme, in which silver is sputter deposited between very thin layers of nichrome nitride. Excellent corrosion resistance is achieved with a silicon nitride overcoat. Samples were exposed to a variety of atmospheres and it was found that the nichrome nitride dramatically increased corrosion resistance when compared to bare silver or silicon nitride coated silver. Similar results were found when electrochemical impedance spectroscopy was used to evaluate samples. The enhanced corrosion resistance is achieved even when the thickness of the nichrome nilTide adhesion layer is too thin to be considered continuous.

Corrosion Resistance of Nitric Acid Passivated Cr-Ni-Mo Stainless Steel

2016 ◽  
Vol 858 ◽  
pp. 196-201
Author(s):  
Viera Zatkalíková ◽  
Lenka Markovičová
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Nitric Acid ◽  
Biomedical Applications ◽  
Electrochemical Impedance ◽  
Austenitic Stainless Steels ◽  
Mass Losses ◽  
Excellent Corrosion Resistance ◽  
Acidic Chloride Solution ◽  
Acidic Chloride

Austenitic stainless steels are considered materials with excellent corrosion resistance, and with acceptable mechanical properties. Therefore they are recommended for various constructional, industrial and biomedical applications. However they are prone to the pitting corrosion in aggressive chloride environments. The aim of this study is to evaluate the corrosion resistance of AISI 316Ti stainless steel with nitric acid passivated surface at the temperature range 22 – 80 °C in 1M acidic chloride solution. Evaluation of the corrosion resistance is based on the results of exposition immersion tests (visual and microscopic observation of attacked surfaces, mass losses of specimens) and the results of the electrochemical impedance spectroscopy (EIS) tests.

scholarly journals Influence of Growth Defects on the Corrosion Resistance of Sputter-Deposited TiAlN Hard Coatings

Coatings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 511 ◽  
Author(s):  
Panjan ◽  
Drnovšek ◽  
Gselman ◽  
Čekada ◽  
Panjan ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Cross Sections ◽  
Focused Ion Beam ◽  
Electrochemical Impedance ◽  
Ion Beam ◽  
Hard Coatings ◽  
Growth Defects ◽  
Coating Morphology ◽  
Before And After ◽  
Sputter Deposited

In this work, the causes of porosity of TiAlN hard coatings sputter deposited on D2 tool steel were studied since its corrosion resistance is mainly affected by imperfections within the coating (e.g., pinholes, pores, crevices). The corrosion test was performed in a chlorine solution using electrochemical impedance spectroscopy. The coating morphology of growth defects before and after the exposure was studied by scanning electron microscopy (SEM), while focused ion beam (FIB) was used to make series of cross-sections through individual selected defects. We confirm that pitting corrosion is closely related to the through-thickness growth defects. It was also found that in the case of nodular defects, the intensity of corrosion depends on the shape of the seed.

Electrochemical Characteristics of an Optimized Ni-P-Zn Electroless Composite Coating

2014 ◽  
Vol 1043 ◽  
pp. 124-128 ◽  
Author(s):  
Amir Kordijazi
Keyword(s):  
Corrosion Resistance ◽  
Composite Coating ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Corrosion Current ◽  
Electrochemical Characteristics ◽  
High Corrosion ◽  
Excellent Corrosion Resistance ◽  
Coating Composition ◽  
Spray Technique

An optimized electroless solution was used to deposit the Ni-P-Zn composite coating. Potentiodynamic polarization test, salt spray technique and electrochemical impedance spectroscopy were utilized to study electrochemical characteristics of the as-deposited coating. All results demonstrate an excellent corrosion resistance of the as-deposited layer. Corrosion current density of the coating was compared to some similar coatings reported in other papers to study reasons of its high corrosion resistance. It was proved that the high corrosion protection of the coating is due to the optimization of P and Zn contents in the coating composition.

ULBRICH TITANIUM GRADE 1 (UNS R50250)

Alloy Digest ◽  
2020 ◽  
Vol 69 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Stainless Steels ◽  
Pure Titanium ◽  
Harsh Environments ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Excellent Corrosion Resistance ◽  
Titanium Grade

Abstract Ulbrich Titanium Grade 1 (UNS R50250) is an unalloyed commercially pure titanium. It is one of the softest and the most ductile of the commercially pure grades, and exhibits excellent formability. It has excellent corrosion resistance and is mainly used in marine and chemical industries where the parts are exposed to very harsh environments. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on forming. Filing Code: Ti-165. Producer or source: Ulbrich Stainless Steels & Special Metals, Inc.

Review on Weldability Prospects of Super Austenitic Stainless Steels

2021 ◽  
Vol 903 ◽  
pp. 33-43
Author(s):  
Srirangan Arunkumar ◽  
Sridharan Seshadri
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
Dissimilar Materials ◽  
Austenitic Stainless Steels ◽  
Harsh Environments ◽  
Excellent Corrosion Resistance ◽  
Metal Form ◽  
Structural Applications ◽  
Piping Systems ◽  
Desalination Plants

Super Austenitic Stainless Steels (SASS) belongs to the category of austenitic stainless steels which were known for their excellent corrosion resistance when used in structural applications like desalination plants, oil piping systems, heat exchanger equipments which demands high temperature service and harsh environments. Several works on SASS dealt about the corrosion resistance of the material in its normal base metal form. But structural uses needs SASS to be welded with similar or dissimilar materials to fit into the applications. This study aims to present a detailed view on issues related to the weldability of super austenitic stainless steels and the future scope of welding on SASS.

Study on corrosion resistance behavior and formation mechanism of Ce conversion coating on manganese

2021 ◽  
Vol 118 (3) ◽  
pp. 319
Author(s):  
Sihua Lei ◽  
Fei Lu ◽  
Shuai Wang ◽  
Hong Zhong ◽  
Zhanfang Cao ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Formation Mechanism ◽  
Electrochemical Impedance ◽  
Conversion Coating ◽  
Alkali Resistance ◽  
Conversion Coatings ◽  
Environmental Friendliness ◽  
Electrochemical Tests ◽  
Excellent Corrosion Resistance ◽  
Acid And Alkali Resistance

Ce conversion coatings have received extensive attention from researchers due to their excellent corrosion resistance and environmental friendliness. Here, Ce conversion coatings on manganese were prepared by treating in the cerium nitrate conversion solution. The influence of treating parameters was studied and optimized. The surface morphology, element composition and chemical state of Ce conversion coatings were studied by means of SEM, EDS, XRD and XPS. Electrochemical methods of polarization curve and electrochemical impedance were used to study the corrosion resistance of conversion coatings. The results showed that the Ce conversion coating contained mainly Mn, O and Ce, and its forms were manganese oxide and cerium oxide. Electrochemical tests showed that Ce conversion coating can not only effectively improve the corrosion resistance of manganese substrate, but also has good acid and alkali resistance. Discussion on the formation mechanism of cerium conversion coating shows that the conversion treatment is beneficial to inhibit the further oxidation of manganese to the higher valence state.

Corrosion Behavior of Porous Ti-24Nb-4Zr Alloy in Different Simulated Body Fluids

2011 ◽  
Vol 399-401 ◽  
pp. 1577-1581
Author(s):  
Yu Xuan Li ◽  
Zhen Duo Cui ◽  
Xian Jin Yang ◽  
Sheng Li Zhu
Keyword(s):  
Corrosion Resistance ◽  
Biomedical Applications ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Ph Values ◽  
Porous Ti ◽  
Ti Alloys ◽  
Excellent Corrosion Resistance ◽  
Conventional Sintering

Porous Ti alloys are novel biomedical candidates for surgical implant application. The corrosion resistance of porous Ti-24Nb-4Zr alloy with 41.54% porosity prepared from conventional sintering was investigated by means of open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy techniques in 0.9% NaCl physiological and Hank’s solutions with different pH values (2.4, 5.4, 7.4) at 310 K, respectively. Meaning solid Ti-24Nb-4Zr alloy was chosen as a reference. Porous Ti-24Nb-4Zr alloy shows wide passive regions based on anodic polarization curves. These observations suggest that porous Ti-24Nb-4Zr alloy owns excellent corrosion resistance. Therefore, they are potential for biomedical applications.

COPPER ALLOY No. 954

Alloy Digest ◽  
1975 ◽  
Vol 24 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Copper Alloy ◽  
Iron Alloy ◽  
High Strength ◽  
Heat Treating ◽  
Good Resistance ◽  
Excellent Corrosion Resistance ◽  
Aluminum Iron ◽  
Copper Aluminum

Abstract Copper Alloy No. 954 is a copper-aluminum-iron alloy characterized by high strength and hardness, good resistance to fatigue and wear, and excellent corrosion resistance. It is suited for service up to 750 F. 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-292. Producer or source: Copper alloy foundries.

MUELLER ALLOY 3140

Alloy Digest ◽  
1983 ◽  
Vol 32 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
Heat Treating ◽  
Lead Content ◽  
Atmospheric Conditions ◽  
Excellent Corrosion Resistance ◽  
High Copper ◽  
Screw Machine

Abstract MUELLER Alloy 3140 is a high-copper alloy with moderate strength, a rich bronze color and excellent corrosion resistance. Its lead content gives it excellent machinability which makes it suitable for screw-machine applications. Its uses include many screw-machine products, decorative hardware, pickling crates and parts to resist severe atmospheric conditions. 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: Cu-451. Producer or source: Mueller Brass Company.

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