Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

Recent Advances On The Influence Of Microstructural Characteristics On Corrosion Resistance In H2SO4 Of Anodized Titanium

Picture for Recent Advances On The Influence Of Microstructural Characteristics On Corrosion Resistance In H2SO4 Of Anodized Titanium
Available for download

Industrial usage of Plasma Electrolytic Oxidation (PEO) has grown consistently in recent years, thanks to the improved characteristics imparted to the oxide film in terms of surface adhesion, hardness, crystallinity, uniformity, and corrosion resistance. The metallic substrate is not subjected to elevated temperature and the overall equipment complexity is relatively simple, making the technique a good candidate for surface functionalization. In PEO treatments, high voltages are employed (~ 150-750 V 1) allowing for the formation of an insulating, or at least semiconductive, oxide layer that’s limits ion transport responsible for the initial coating growth. Beyond the spark voltage (prerequisite the enter the PEO regime) oxidation does not occur only as the result of a continuous flow of ions but rather it takes place after the cooling of a plasma discharge.

Product Number: 51322-17589-SG
Author: Luca Casanova, MariaPia Pedeferri, Gianluigi A. Botton, Marco Ormellese
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
$0.00
$20.00
$20.00

Commercially pure titanium has been anodized with the use of a pulsed signal in unipolar regime, with 25 % of anodic contribution at low frequency (20 Hz). This anodizing regime can effectively enhance thickness and crystallinity of the barrier region directly in contact with the metallic substrate. The latter condition will be particularly advantageous for corrosion resistance enhancement in strong reducing acidic environment, as concentrated hot sulfuric acid (10 %v/v at 60 °C). Corrosion response has been investigated through the use of Electrochemical Impedance Spectroscopy (EIS) and results compared with weight-loss tests and Linear Polarization Resistance (LPR). The higher degree of crystallinity of the coating, in the interfacial region, will be found to provide an effective barrier against proton diffusion thus retarding debonding of the oxide promoted by hydrogen evolution reaction (HER).

Commercially pure titanium has been anodized with the use of a pulsed signal in unipolar regime, with 25 % of anodic contribution at low frequency (20 Hz). This anodizing regime can effectively enhance thickness and crystallinity of the barrier region directly in contact with the metallic substrate. The latter condition will be particularly advantageous for corrosion resistance enhancement in strong reducing acidic environment, as concentrated hot sulfuric acid (10 %v/v at 60 °C). Corrosion response has been investigated through the use of Electrochemical Impedance Spectroscopy (EIS) and results compared with weight-loss tests and Linear Polarization Resistance (LPR). The higher degree of crystallinity of the coating, in the interfacial region, will be found to provide an effective barrier against proton diffusion thus retarding debonding of the oxide promoted by hydrogen evolution reaction (HER).

Product tags
Also Purchased
Picture for Reduction Of Conservatism In SSC Testing For Sour Gas Well Tubulars
Available for download

Reduction Of Conservatism In SSC Testing For Sour Gas Well Tubulars

Product Number: 51322-17776-SG
Author: Marc Wilms, Johan Smit, Willem Maarten van Haaften, Sytze Huizinga, Wouter Koot, Daniela Garcia, Harold Evin, Michel Bonis, Hervé Marchebois, Edmund J.F. Dickinson, Gareth Hinds
Publication Date: 2022
$20.00

Martensitic stainless steel (MSS) well tubulars are favorable due to their high strength and relatively low cost and are therefore widely applied in the Oil & Gas industry. This is especially the case for 13Cr and Super13Cr grades, which are often selected for mildly sour gas fields, where a relatively low content of H2S is present. When selecting martensitic stainless steels for sour service, the susceptibility to Stress Corrosion Cracking (SCC) and Sulfide Stress Cracking (SSC), determined by standard laboratory tests, are the most important selection criteria.
Picture for Refinement Of Citric Acid Passivation Methods And Comparison To Traditional Nitric Acid Based Chemistries
Available for download

Refinement Of Citric Acid Passivation Methods And Comparison To Traditional Nitric Acid Based Chemistries

Product Number: 51322-17628-SG
Author: David G. Enos, Derek Wichhart
Publication Date: 2022
$20.00

Traditional solutions for the chemical passivation of stainless steel are nitric acid based, with the addition of sodium dichromate as an inhibitor for precipitation hardened and free machining stainless steels. These passivation chemistries are difficult to handle from an environmental health and safety point of view, particularly the dichromate inhibited versions. Citric acid passivation has been pursued as a replacement for both nitric acid and inhibited nitric acid based chemistries for many years, and has been incorporated into consensus specifications such as ASTM A967 and SAE AMS2700.
Picture for Predictive Coating Condition Model For Coating Lifetime Under Environmental Stressors
Available for download

Predictive Coating Condition Model For Coating Lifetime Under Environmental Stressors

Product Number: 51322-17685-SG
Author: Victoria Avance, Brandi Clark, Liam Agnew, Fritz Friedersdorf
Publication Date: 2022
$20.00

The corrosion of aircraft costs the U.S. Department of Defense billions of dollars annually and accounts for a significant portion of maintenance time and costs.1 Coatings are the most effective way to protect aircraft, but they have a finite lifetime and must be maintained or replaced before the underlying substrate is damaged by corrosion. Current aircraft maintenance practices call for coating inspections and maintenance based on elapsed time and not on measurements of coating health. Coating lifetime varies depending on the environmental stressors experienced in service, including temperature, humidity, and salt loading.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support