Physical Sciences and Mathematics Commons^™

Effect Of Passivation And Surface Treatment Of A Laser Powder Bed Fusion Biomedical Titanium Alloy On Corrosion Resistance And Protein Adsorption, Saman Nikpour, Jeffrey Henderson, Sina Matin, Heng-Yong Nie, Jonas Hedberg, Vahid Dehnavi, Yara Hosein, David Holdsworth, Mark Biesinger, Yolanda Hedberg

Chemistry Publications

The biomedical titanium alloy Ti6Al4V has excellent corrosion resistance and biocompatibility and is, therefore, widely used in orthopedic and orthodontic implants. Biomedical implants are increasingly fabricated by additive manufacturing, such as laser powder bed fusion (LPBF). These manufacturing protocols often include sandblasting, surface finish, and passivation. This study aims to investigate the effect of different surface finishes and the commonly used ASTM F86-13 nitric acid passivation for LPBF Ti6Al4V on its corrosion resistance, metal release, and surface changes in benign (bovine serum albumin in a pH 7.4 buffer) and harsh (hydrochloric acid at pH 1.5) solutions using various electrochemical and …

Synergistic Effect Of Nanoclay And Barium Sulfate Fillers On The Corrosion Resistance Of Polyester Powder Coatings, Jinbao Huang, Marshall Shuai Yang, Chengqian Xian, James Joseph Noel, Yolanda S. Hedberg, Jian Chen, Ubong Eduok, Ivan Barker, Jeffrey Daniel Henderson, Haiping Zhang, Liqin Wang, Hui Zhang, Jesse Zhu

Chemistry Publications

No abstract provided.

Ohmic Drop Compensation In Electrochemical Measurement, Jia-Qi Chen, Xu-Xu Ye, Ling-Wen Liao, Zhen Wei, Mian-Le Xu, Yan-Xia Chen

Journal of Electrochemistry

The solution resistance (R_u) between the working electrode (WE) and the reference electrode (RE) may lead to significant Ohmic drop (iR_u) and deviation of actually applied potential at the WE to the desired ones in electrochemical measurement. In the case of high current or large R_u, iR_u compensation is imperative. Errors associated with insufficient compensation of theiR_u drop may significantly affect the accuracy of data measured by conventional electrochemical methods, which may consequently result in wrong judgment and conclusions. In this article, we discuss important factors which may affect …

Optimization Of Microbial Fuel Cells, Norberto M. Gonzalez

Dissertations

Optimization of microbial fuel cells is investigated by utilizing Shewanella oneidensis as a model microorganism. the microbe's ability to grow and use glucose as a carbon source is explored under varying oxygen environments through an offline PMP derivatization method and HPLC analysis. Shewanella growth and glucose utilization is enhanced under aerobic environments; however, under microaerobic environments the addition of ferric iron results in a faster exponential growth initialization. a flavin mononucleotide modified indium tin oxide electrode is prepared and characterized for its usefulness in microbial fuel cells by controlled potential electrolysis, cyclic voltammetry, and electrochemical impedance spectroscopy studies. the electrode …

Research On Internal Resistance Monitor System Of Vehicle Fuel Cell Integrated With Dc/Ac/Dc, Deng Jian, Haiquan Lü, Liyan Zhang, Shuhai Quan

Journal of System Simulation

Abstract: In order to solve the problem of complicated and costly on-line impedance monitoring operation of vehicle fuel cells, a test method that can obtain the electrochemical impedance spectroscopy (EIS) of fuel cell by Fourier transformation against output voltage and output current of fuel cell through DC/DC generation of micro-current signal is proposed. This method is integrated in a cascaded system of parallel Boost and DC/AC/DC. The parallel Boost can realize the decoupling of power transmission and disturbance signal, the DC/AC/DC converters can achieve higher boost ratios, which makes the test system more suitable for higher voltage levels such as …

An Investigation Of The Synergistic Effect Between (1,3-Dioxolan-2-Ylmethyl)Triphenylphosphonium Bromide And Iodide Ion For The Corrosion Inhibition Of Zinc In Citric Acid, Saadawy M.

Journal of Electrochemistry

The effect of (1,3-Dioxolan-2-ylmethyl)-triphenylphosphonium bromide (DTPB) on the zinc corrosion in 0.5 mol·L^-1 citric acid solution was investigated at 30 ^oC using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. An ecofriendly bath was used for acid cleaning of zinc, which has not been widely used in literatures. The results showed that DTPB could serve as an effective inhibitor for the zinc corrosion in a citric acid solution with the inhibition efficiency of 98.9% at the DTPB concentration of 3×10^-3 mol·L^-1. A synergistic effect between DTPB and potassium iodide (KI) enhanced the inhibition …

Slides: Klamath Basin Agreements: Largest River Restoration Project In American History, Amy Cordalis

Innovations in Managing Western Water: New Approaches for Balancing Environmental, Social and Economic Outcomes (Martz Summer Conference, June 11-12)

Presenter: Amy Cordalis, Staff Attorney, Yurok Tribe

34 slides

Slides: Moffat Collection System Project, Travis Bray

Innovations in Managing Western Water: New Approaches for Balancing Environmental, Social and Economic Outcomes (Martz Summer Conference, June 11-12)

Presenter: Travis Bray, Project Manager, Moffat Collection System Project, Denver Water

45 slides

Naio4 Oxidation Of Mussel Adhesive Protein Film And Its Corrosion Protection For Mg-1.0ca Alloy, Rui-Qing Hou, Ping-Li Jiang, Shi-Gang Dong, Chang-Jian Lin

Journal of Electrochemistry

The effect of oxidation of mussel adhesive protein (Mefp-1) film on the corrosive resistance for Mg-1.0Ca alloy was investigated by scanning electron microscopy (SEM), atom force microscopy (AFM), electron probe microanalysis (EPMA), Infrared reflection absorption spectroscopy (IRAS) and electrochemical methods. The results showed that the NaIO₄ induced oxidation of the pre-formed Mefp-1 film with porous morphology involved structural change of the DOPA group in the protein and resulted in a more uniform film with net-like morphology. The protein film without oxidation had an increasing resistance for the corrosion of Mg-1.0Ca alloy up to 7 days exposure. After oxidation, Epit …

Navigating A Pathway Toward Colorado's Water Future: A Review And Recommendations On Colorado's Draft Water Plan, Lawrence J. Macdonnell, Colorado Water Working Group

Books, Reports, and Studies

40 pages (includes color illustrations).

Materials For Presentation: Water Banks: Voluntary And Flexible Water Supplies For The Colorado River's Uncertain Future [Outline], Robert Wigington

Navigating the Future of the Colorado River (Martz Summer Conference, June 8-10)

4 pages.

"Robert Wigington, The Nature Conservancy"

Eis Study On The Change Of Resistance And Water Absorption During The Failure Graduation Of Inorganic Zinc-Rich/Epoxy/Aliphatic Polyurethane Composite Coatings, Shao-Ping He, Jin-Ping Xiong, Yu-Ming Tang, Yu Zuo

Journal of Electrochemistry

The failure process of inorganic zinc-rich/micaceous iron oxide epoxy/aliphatic polyurethane composite coatings in 3.5% NaCl solution under ultraviolet radiation(UV) was studied with Electrochemical Impedance Spectroscopy(EIS).The result shows that the protective property of the coating was enhanced with the increase of total coating thickness,but the degree of improvement reduced gradully as the coating thickness increased.The shielding effect of the micaceous iron oxide epoxy was mainly reflected in the initial period of the service process,while in later period the coating performance largely depended on the zinc-rich primer.The change of the water uptake in the composite coating presented a 'three-stage' characteristic.The thinner the …

Slides: Climate Change Adaptation And The Federal Lands, Robert L. Glicksman

The Past, Present, and Future of Our Public Lands: Celebrating the 40th Anniversary of the Public Land Law Review Commission’s Report, One Third of the Nation’s Land (Martz Summer Conference, June 2-4)

Presenter: Robert L. Glicksman, J.B. and Maurice C. Shapiro Professor of Environmental Law, George Washington University Law School (Washington, D.C.)

12 slides

Slides: Livestock Grazing On The Public Lands, Joe Feller

The Past, Present, and Future of Our Public Lands: Celebrating the 40th Anniversary of the Public Land Law Review Commission’s Report, One Third of the Nation’s Land (Martz Summer Conference, June 2-4)

Presenter: Joe Feller, Professor of Law, Arizona State University Law School; Visiting Professor, University of Colorado Law School

33 slides

Slides: Introduction To Constructive Engagement In The Oil And Gas Industry, Susan T. Wildau, Christopher W. Moore

Best Practices for Community and Environmental Protection (October 14)

Presenters: Susan T. Wildau and Christopher W. Moore, CDR Associates (Collaborative Decision Resources), Boulder, CO

22 slides

Slides: Transboundary Solutions: A Water Trust, Policy, And Environmental Flows For The Colorado River Delta, Jennifer Pitt

Western Water Law, Policy and Management: Ripples, Currents, and New Channels for Inquiry (Martz Summer Conference, June 3-5)

Presenter: Jennifer Pitt, Environmental Defense Fund, Boulder, CO

26 slides

Effect Of Naphthalene Water Reducer On Corrosion Behavior Of Reinforcing Steel In Concrete, Yu-Ming Tang, Jie Zhang, Yu Zuo

Journal of Electrochemistry

The influence of naphthalene water reducer on corrosion behavior of reinforcing steel in concrete was studied by the methods of corrosion potential measurement,linear polarization and EIS test.The values of concrete resistance(Rc) and polarization resistance(Rp) of the samples with naphthalene water reducer were higher than those without naphthalene water reducer,especially in the concrete with 0.2 percent naphthalene water reducer.A suitable amount of water reducer can improve the pore structures of concrete,increase the concrete compactness and impermeability,and decrease corrosion rate of rebars in concrete.

The Mechanism Of Electrochemical Testing Method Under Synergistic Effect Of Nacl And Water Vapor At 600℃, Li Liu, Ying Li, Fu-Hui Wang

Journal of Electrochemistry

The existence of electrochemical reaction during the corrosion process of pure Fe under a deposit of solid NaCl in water vapor at above 400 ℃ had been detected by measuring the corrosion current using double-layer electrode.In EIS measurement,only one capacitive loop was obtained on the pure metals and this gave the information of oxide layer on them.The electrochemical impedance spectroscopy(EIS) and scanning-electron microscopy(SEM) results testified that there is a good relationship between the resistance of oxide layer Rox and the corresion reaction rate for pure metals with different oxidation times.The electrochemical technique is an effective method for studying corrosion performance …

Localised Galvanic Corrosion Processes In Thermal Spray Coated/Cast Aluminium Alloy Systems, David Culliton, Tony Betts, David Kennedy

Conference Papers

Cast Aluminium Alloys, because of the propensity of aluminium to react with impurities and alloying elements, are prone to developing IM impurities during the solidification process. These IM phases can act, in some fluids, as initiation sites for localised corrosion processes, resulting in degradation phenomena, such as pitting. Whilst Thermal Spray coatings can improve the wear resistance of Cast Aluminium Alloys, their corrosion performance may be hampered by the presence of through porosity within the coating.

The present work details some preliminary studies of the localised corrosion processes occurring at the interface area between a Thermal Spray coating and a …

Applications Of Electroless Deposition Ni-Cu-P Coating On The Gas Condensing Exchanger, Li-Jun Yang, Gui-Chang Liu, Sui-Lin Wang, Zhi-Cong Shi

Journal of Electrochemistry

The effects of copper sulfate concentration in the plating solution on the composition,the structure and the anticorrosion properties of Ni-Cu-P deposited coating were studied by EPMA、XRD and polarization curves.The anticorrosion properties of Ni-Cu-P deposited coating was optimal as the copper sulfate concentration in the plating solution was 0.5 g·L-1.The electrochemical anticorrosion properties of Ni-Cu-P,Ni-P deposited coatings and copper plates were investigated in the gas condensate.The self-corrosion potential of Ni-Cu-P deposited coatings was low,the self-corrosion current density was small,and the electrochemical impedance was the highest.Therefore,the electroless Ni-Cu-P coatings can be used as anticorrosion cover and anodic sacrificial protective coatings of copper …

Inhibition Of Amino Acids Against Steel In Hydrochloric Acid Solution, Ming-Yan Cheng, Wei-Ming Wu, He-Ming Liu, Hai-Yan Du

Journal of Electrochemistry

The inhibition effect of glutamic acid towards the corrosion of X65 steel in hydrochloric acid solution(10%) was investigated using polarization techniques、electrochemical impedance spectroscopy(EIS) and SEM.The corrosion rate,corrosion potential(Ecoor),polarization resistance(Rp) and inhibition efficiency(η) were determined.The results revealed that the inhibitor is a mixed type inhibitor.It has promising corrosion inhibition efficiency at low concentrations.The inhibition efficiency(η) increased with increasing the concentration.The maximum inhibition efficiency appeared at 0.3 g·L-1.

Agenda: Securing Environmental Flows On The Colorado River In An Era Of Climate Change: Issues, Challenges, And Opportunities, Western Water Policy Program, University Of Colorado Boulder. Natural Resources Law Center, Nature Conservancy (U.S.), Trout Unlimited, Environmental Defense (Organization), Western Water Assessment (Program), Western Resource Advocates, United States. Bureau Of Reclamation

Securing Environmental Flows on the Colorado River in an Era of Climate Change: Issues, Challenges and Opportunities (March 21)

The Colorado River is the primary surface water resource of the Southwest, providing water to approximately 30 million residents. Studies and policy decisions associated with a recently completed EIS point to an ever-tightening water supply due to longstanding growth pressures exacerbated by significant climate change impacts. Given these trends, how can the river’s environmental needs be satisfied?

On March 21st, the Center’s Western Water Policy Program brought together four leading Colorado River experts along with an audience of approximately 70 water professionals to discuss “Securing Environmental Flows on the Colorado River in an Era of Climate Change: Issues, Challenges, and …

Electrochemical Behavior Of Dill Pipe In 31%(By Mass)Nacl Solution Based New Type Inhibitor, Fu-Guo Liu, Min Du, Qing-Zhang Wang

Journal of Electrochemistry

The inhibitive effect of compound inhibitor including emulsifier(P)、zinc sulfate、sodium polyphosphate、Glucose Gluconate was studied in 31% NaCl(bymass) solution.The inhibitory mechanism was analyzed by polarization curve and EIS.The results showed that the compound inhibitor was anodic-type inhibitor and its inhibitive effect on anodic and cathodal reaction was the most obvious at 200×10-6g·L-1.And the results of EIS revealed that the inhibition efficiency increased and the film formed on electrode surface was more and more compact with time.Inhibition mechanism was different with concentration of inhibitor.

Study On The Corrosion Of Chlorine Condenser By Electrochemical Method, Bin Xiang, Wen Chen, Wen-Zhang Huang, Shao-Hua Xing, Sheng-Tao Zhang

Journal of Electrochemistry

Corrosion of condenser is very seriously in chlorine-alkali industry,which could lead to fatal disaster.The most commonly used material in low pressure condenser includes steel of 16MnR,10#,and welding rod of J507.Electrochemical analysis of the three materials in 29.9%(by mass) calcium chloride(CaCl2) solution was carried out.The corrosion current density icorr and impedance parameters of the three materials in 29.9% CaCl2 solution were estimated separately.The result showed that in the tripartite phase regions where the 10# seamless tube and 16MnR armor plate were jointed by welding,the weld was firstly eroded and suggested that the chlorine condenser should be examined and repaired every year.

Slides: Forest And Rangeland Planning, Nepa Analysis And Decisions, Glenn Casamassa

The Future of Natural Resources Law and Policy (Summer Conference, June 6-8)

Presenter: Glenn Casamassa, Forest Supervisor, Arapahoe-Roosevelt National Forest

17 slides

Slides: Nepa And Public Participation In Grazing Management On Federal Public Lands: The 40-Year Struggle, Joe Feller

The Future of Natural Resources Law and Policy (Summer Conference, June 6-8)

Presenter: Joe Feller, College of Law, Arizona State University

22 slides

Slides: Forests And Grasslands, Federico Cheever

The Future of Natural Resources Law and Policy (Summer Conference, June 6-8)

Presenter: Professor Federico Cheever, University of Denver Sturm College of Law

30 slides

Slides: The Roadless Rules And The Roles Of States And Communities, Sharon Friedman

The Future of Natural Resources Law and Policy (Summer Conference, June 6-8)

Presenter: Sharon Friedman, Director of Planning, USDA Forest Service, Rocky Mountain Region

13 slides

Slides: Dam Building And Removal On The Elwha: A Prototype Of Adaptive Mismanagement And A Tribal Opportunity, William H. Rodgers, Jr.

The Future of Natural Resources Law and Policy (Summer Conference, June 6-8)

Presenter: William H. Rodgers, Jr., Stimson Bullitt Professor of Environmental Law, University of Washington School of Law

77 slides

Slides: The Future Of Oil And Gas Development On Federal Lands, Mike Chiropolos

The Future of Natural Resources Law and Policy (Summer Conference, June 6-8)

Presenter: Mike Chiropolos, Lands Program Director, Western Resource Advocates

44 slides