Corrosion resistance of electrodeposited Zn-Cr alloy coatings V. Chakarova 1, Tz. Boiadjieva-Scherzer 2, H. Kronberger 3 and M. Monev 1* 1 Institute of.

Slides:



Advertisements
Similar presentations
Outline Curriculum (5 lectures) Each lecture  45 minutes
Advertisements

Experimental Investigation of Aluminum Nitride and Vanadium Nitride Solubility in Medium-Carbon Steels William Christman, Lee M. Rothleutner, Dr. Chester.
Ruizhen Li School of Chemistry and Environment South China Normal University Guangzhou China Study on Lead Based Rare Earth Alloys for Positive Grids of.
Introduction. The successful implementation of copper electroplating in the metallization of chip interconnect structures derives from the use the electrolyte.
Tarnish and corrosion Dr. Waseem Bahjat Mushtaha Specialized in prosthodontics.
GIANT MAGENTORESISCANCE AND MAGNETIC PROPERTIES OF ELECTRODEPOSITED Ni-Co-Cu/Cu MULTILAYERS.
Y12 HSC Chemistry Shipwrecks and Corrosion R. Slider
Unit 11- Redox and Electrochemistry
Metals Nat
Electrochemical formation of Porous Silicon in Room Temperature Ionic Liquid O. Raz, D. Starosvetsky and Y. Ein-Eli. Introduction: Porous Silicon (PS)
2 Section.
Electrolytic Cells Is a Galvanic Cell forced to operate in reverse Process is called electrolysis This occurs if a voltage greater than that produced by.
High Capacity Graphite Anodes for Li-Ion battery applications using Tin microencapsulation Basker Veeraraghavan, Anand Durairajan, Bala Haran Ralph White.
Hector Colon, Prabhu Ganesan, Bala Haran, R. E. White and Branko Popov Department of Chemical Engineering University of South Carolina, Columbia, South.
Department of Chemical Engineering University of South Carolina SC Novel Process for Deposition of Non-Anomalous Amorphous Ni-Zn-P Alloys for Replacement.
Electrochemical Aspects of Copper Chemical Mechanical Planarization (CMP) Esta Abelev, D. Starosvetsky and Y. Ein-Eli. Introduction: Copper is used as.
Chapter 19 Electrochemistry
Electrochemistry Chapter 20.
Corrosion in active state Jacek Banaś J. Banaś, Corrosion Resistant Alloys. Fundamental Aspects of Material Selection, in Metallurgy on the Turn of the.
Corrosion and Condition Assessment of Galvanized Steel Reinforcement in Concrete Structures Dr. Jane Jieying Zhang Critical Concrete Infrastructure October.
Electroless 0,3 µm Au coating on thick Ni, deposited on Si a b a – surface morphology and Auger profiling spectroscopy b – cross section morphology and.
CORROSION:- TYPES EFFECTS & PREVENTION PRESENTED BY: GAUTAM AHUJA
© 2012 Su-Jin Kim GNU Surface & Metrology Manufacturing Processes 4. Surface & Metrology.
PREPARATION OF ZnO NANOWIRES BY ELECTROCHEMICAL DEPOSITION
§7.11 Polarization of electrode
Electrochemistry. Electrochemical Cells  Electrons are transferred between the particles being oxidized and reduced  Two types –Spontaneous = Voltaic.
By PhD student Iman Adnan Supervised by Prof. Dr. Mohammed J. Al-Tameemi Prfo.Dr. Sami I. Al-Rubaiey.
Reporter : Chang-Fu Lain Professor: Cheng-Ho Chen Date : 6/11.
Pasivity. Faraday’s Experiment (1840s) Faraday’s Experiment (Contd..) We can have some observations from this set of experiments:  Corrosion of a metal,
Evaluation of the Susceptibility of Simulated Welds In HSLA-100 and HY-100 Steels to Hydrogen Induced Cracking R. E. Ricker, M. R. Stoudt, and D. J. Pitchure.
Tinplate Products DONGBU STEEL CO., LTD.
Metals, Making Electricity and Corrosion. Metals The job that a metal is used for is determined by its physical and chemical properties. Physical properties.
Atmospheric corrosion monitoring and modeling of a low alloy steel under an electrolyte film in cyclic wet–dry condition Prof. Dr. Junhua Dong Environmental.
Cell potential is related to concentrations Electrodes can be used that are sensitive to specific ions They measure concentrations of specific ions which.
Polarization.
§7.13 Corrosion and protection of metals. 1) Corrosion: Destruction of materials due to the chemical, electrochemical and physical attack of the media.
At 25°C an aqueous solution will be acidic if a. [H3O+] > [H2O] b. [OH-] = [H3O+] c. [H3O+] > M d. [OH-] > ‑ M Answer: C.
-Phosphate post-treatment of spontaneous spray deposited cerium-based conversion coatings (CeCCs) on Al 2024-T3 increases their corrosion performance -The.
Synthesis of diamond-like carbon films with super-low friction and wear properties A. Erdemir, O.L. Eryilmaz, and G. Fenske J. Vac. Sci. Technol. A 18(4),
Aluminum, its Corrosion Types, and Anodization Sun Mi Kim MSE 410 Project.
Corrosion properties of water based and high solids Aerospace coating systems. IMFAIR th & 11th June 2009 Peter de Bruin Akzo Nobel Aerospace.
A b c Fig. 1: Specimen shape and dimensions. Fig. 2: Experimental arrangement for corrosion measurement during an immersion test with a fishing line specimen.
Nanostructered Co-W alloys produced by electrodeposition as replacement for hard chromium on aerospace components S.J. Harris, D.P. Weston, P.H. Shipway.
Ho-Gun Kim, Seung-Ho Ahn, Jung-Gu Kim, *Se-Jun Park, *Kwang-Ryol Lee, **Rizhi Wang SungKyunKwan University, Korea *Korea Institute of Science and Technology,
Introduction. During the last decade the interest in copper passivity significantly increased due to the important role of copper in microelectronic industry.
M.S. Hossain, N.A. Khan, M. Akhtaruzzaman, A. R. M. Alamoud and N. Amin Solar Energy Research Institute (SERI) Universiti Kebangsaan Malaysia (UKM) Selangor,
GC : Hot dip galvanisation
Mapping Erosion-Corrosion of Composite WC/Co-Cr Based Coating
Reactions of Metals. Reactions of Metals with H 2 O The metal is the anode and will be oxidized. 2H 2 O + 2e-  2OH - + H 2 E° = V Mg  Mg 2+ +
Thermal annealing effect of tetrahedral amorphous carbon films deposited by filtered vacuum arc Youngkwang Lee *†,Tae-Young Kim*†, Kyu Hwan Oh†, Kwang-Ryeol.
1 CHAPTER 2 (ii) CORROSION PRINCIPLES Chapter Outlines 2.5 Electrochemical Aspects (cont`) 2.6 Environmental Effects 2.7 Metallurgical and Other Effects.
Introduction. During the last decade the interest in copper passivity significantly increased due to the important role of copper in microelectronic industry.
Phosphating on Ferrous and Aluminium Alloys
課 程:高等物理冶金 課堂教師:戴子堯 副教授 報 告 者:蔡中銘
COATING AND DEPOSITION PROCESSES
In the name of GOD.
Materials Performance Corrosion/SCC,EAC, etc.
Introduction Results & Discussion At present, disinfection of wells and drinking water pipelines is carried out by treating with chlorine- containing reagents.
The effect of carboxylic acid additives on the structure and corrosion resistance of alumina coatings Abby Koczera Chemical Engineering 2017, University.
Engineering Chemistry CHM 406
Grupo de Investigaciones en Corrosión GIC
Elmira Ghanbari, M. Iannuzzi, M. Rincon Ortiz & R.S.Lillard.
BASICS CORROSION Cells
Research Undergraduate: Alyson Michael Advisor: Dr. Grant Crawford
SEM and EDX study of Stainless Steels, Suggested as Biomaterials
Ceramic Coatings and Linings
KOLÁŘ Jakub, SVATOŠ Vojtěch, HUBÁLEK Jaromír, MOZALEV Alexander
Chapter 2: The Molecules of Cells
Progress of DLC Resistive Electrode
Presentation transcript:

Corrosion resistance of electrodeposited Zn-Cr alloy coatings V. Chakarova 1, Tz. Boiadjieva-Scherzer 2, H. Kronberger 3 and M. Monev 1* 1 Institute of Physical Chemistry, Bulgarian Academy of Sciences, Acad G. Bonchev Str., Bl.11,Sofia 1113, Bulgaria 2 Centre of Electrochemical Surface Technology GmbH, Viktor-Kaplan-Straße 2, 2700 Wiener Neustadt, Austria 3 TU-Vienna, Institute for Chemical Technology and Analytics, Getreidemarkt 9/164ec, A-1060 Vienna, Austria * Introduction Number of studies demonstrate better corrosion protective properties of electrodeposited Zn-Cr alloy coatings on steel in comparison to Zn coatings. The electrodeposition of the Zn-Cr alloy coatings has been optimized for high speed deposition on steel strips for car body application in the automotive industry. In order to obtain the final product, the electrogalvanized steel sheet undergoes further treatments, including application of additional layers in acidic or alkaline solutions. Acknowledgement These investigations have been performed with the support of the Austrian Science Foundation FFG and the government of Lower Austria in the frame of the COMET-program. The authors acknowledge voestalpine Stahl GmbH, Linz, Austria for their co-operation and for providing samples used in the present investigations. Conclusions The steady state potential of the alloy coatings is in about 150 mV more positive than that of Zn (in the boundary case of 10 mass % Cr), but it is still sufficiently negative to the steel substrate to provide sacrificial protection. The shift of the potential in positive direction is related to the Cr content in the alloy. The Zn-Cr alloy coatings are corrosion resistant in a wide range of pH. Significant dissolution is observed when the pH falls below 4.0. The dissolution rate increases with further acidification of the solution. In the acidic range the Zn-Cr alloy dissolves with considerably higher rate than Zn. The dissolution rate of the alloys with higher Cr content is higher. Nevertheless, a bit higher amount of Zn is dissolving. The combined effects of partial or complete dissolution of the corrosion protective film at low pH values and the lower hydrogen overvoltage on the alloys determine the observed behavior. Experimental Zn-Cr alloy coatings with Cr content within the 3-10 mass % range and a thickness within the 3-7 μm range were electrodeposited onto low carbon steel substrates from an electrolyte, containing 40 g/l Zn, 15 g/l Cr (added as sulphates) and polyethyleneglycol (1g/l), pH 2.0, in a flow cell, flow rate 4 m/s, c.d. within the 80 – 120 A/dm 2 range, 40 o C. The Cr content in the alloy coatings was determined by using X-ray fluorescence analysis. The corrosion studies were carried out in 0.5M Na 2 SO 4 solution at temperature of 25 o C. The pH of the solution was varied by addition of H 2 SO 4 or NaOH. Samples with working surface area of cm 2 were used. Aim To investigate the corrosion-electrochemical behavior of Zn-Cr alloy coatings with different Cr content in a model corrosion media, in a wide range of pH (pH 1-13). Zn-Cr 3 % Zn-Cr 10 % а) Zn b)b) b)b) c)c) c)c) b)b)c)c) Zn-Cr 3 % Zn-Cr 10 % E corr / VR P / kΩ Zn Zn-Cr 3 % Zn-Cr 10 % Fig. 1. OCP-time relation obtained in 0.5 M Na 2 SO 4 solution, pH 5.9: a) for steel, Zn and Zn-Cr coatings; b) for Zn coatings with different thickness Fig. 2. Potentiodynamic polarization curves in 0.5 M Na 2 SO 4 solution, pH 5.9 for steel, Zn and Zn-Cr alloy coatings with different Cr content Fig. 3. SEM images of Zn-Cr 3% and Zn-Cr 10% coatings after potentio- dynamic polarization to a potential after the first anodic maximum Fig. 4. Dependence between weight loss for Zn-10%Cr after 3 min immersion time and pH of the 0.5M Na 2 SO 4 solution Fig. 8. SEM images of the surface of Zn and Zn-Cr alloy coatings with different Cr content – before (a) and after corrosion treatment for time duration of 1 min (b) and 3 min (c) in 0.5М Na 2 SO 4 with pH 1.3 Fig. 7. Dissolution rate of Zn and Cr from Zn and Zn-Cr coated samples (working surface area of cm 2 ) in 0.5М Na 2 SO 4 with pH 1.3 Fig. 6. Content of Cr in the alloys before and after corrosion treatment for time duration of 3 min in 0.5М Na 2 SO 4 with pH 1.3 Fig. 5. Dependence between the thickness of Zn-10%Cr after 3 min immersion time and pH of the 0.5M Na 2 SO 4 solution a) b) Results