2 edition of effect of lead ions on the dissolution and passivation of nickel base alloys. found in the catalog.
effect of lead ions on the dissolution and passivation of nickel base alloys.
Written in English
The anodic behaviour of various nickel-base materials has been examined at 90°C using simple acids in the presence of varying levels of lead. Lead, injected at potentials above the Pb++/Pb equilibrium, inhibited active dissolution of Ni due to underpotential deposition, a new observation. The inhibition is higher and happens over a wider range of potentials in the more acidic condition. Activation of Ni results on a surface that is trying to term its pre-passive film but is partly covered by Pb. The Cr content of Alloy 600 is insufficient to eliminate the lead effect, and evidence of nickel-like behaviour is present for this alloy. The presence of 21% Cr suppresses active dissolution, and eliminates, for these particular conditions, both the inhibiting and the activating effects of Pb. The relevance of these results to corrosion and SCC caused by lead in nuclear power systems is briefly discussed.
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removal of lead(II) and copper(II) ions from aqueous solutions. Batch experiments were conducted to determine the effect of varying adsorption parameters on the removal of aqueous lead and copper ions. The adsorption of Pb(II) was found to be maximum at pH using adsorbent dose of g. The adsorption of Cu(II) was found to. ON THE DIFFUSION OF ALLOYING ELEMENTS IN THE NICKEL-BASE SUPERALLOYS Chong Long Fu, Roger Reed∗, Anderson Janotti and Maja Krcmar Metals and Ceramics Division, Oak Ridge National Laboratory, PO Box , TN , USA ∗Dept of Metals and Materials Engineering, The University of British Columbia, Stores Road, Vancouver V6T 1Z4, Canada.
Consequently, the presence of these metal ions may disturb the ion pairs formed between Asp/Glu and Lys/Arg, leading to the destabilization of pyrolysin. In addition, the effect of different ions on protein stability usually follows their ranking in the Hofmeister series, wherein Ca 2+ and Mg 2+ are more powerful hard cations than Na +.Cited by: Aluminum and its Alloys • Low density (~ g/cm3), high ductility (even at room temperature), high electrical and thermal conductivity and resistance to corrosion BUT law melting point (~°C) • Main types of Aluminum Alloys: Wrought Alloys - Cast Alloys - Others: e.g. Aluminum-Lithium Alloys.
Hydrogen peroxide is added to catalyse the reactions. 1. Copper 2. Magnesium 3. Iron 4. Lead 5. Aluminium 6. Brass 7. Solder. Effect of carbonate ions on pyrite (FeS2) dissolution M ICHAËL DESCOSTES 1,2,C ATHERINE BEAUCAIRE 3,F LORENCE MERCIER 4,S ÉBASTIEN SAVOYE 3, J OACHIM SOW 4 andP IERPAOLO ZUDDAS 2.
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The active-passive transition was a process in which an inhibiting effect of phosphate ions on a dissolution of oxide layer was observed.
Capacitance and SEM/EDS examination gave the evidence of two-layered surface film. Kinetics of passivation of nickel-base alloys (Alloy and Alloy ) in high temperature water. Passivation of. Effect of Alloy Composition on the Crevice Corrosion Resistance of Nickel Alloys Conference Paper (PDF Available) in NACE - International Corrosion Conference Series January with Effects of Alloying Elements in Nickel-Base Alloys The different elements that make up an alloy can drastically change the mechanical properties, corrosion resistance and the metal's microstructure.
While chromium, nickel, molybdenum, iron may be the primary alloying elements, other elements like tungsten, carbon, aluminum, titanium, copper and sulfur. nickel concentration. For nickel rich alloys the diffusion of nickel is the rate determining step, and can be analysed theoretically to give good agreement with experiment (7).
The situation becomes more complex when other elements are added to nickel-platinum alloys. For example, Felten examined the effect of platinum on the behaviour of a. Download Citation | Effect of aluminum content on the passivation behavior of Fe–Al alloys in sulfuric acid solution | The passivation behavior of Fe–Al alloys (,Metallic impurities can have a profound effect on electroless nickel plating and can be introduced by drag-in from previous tanks, dissolution of base metal of the substrate (i.e., leaded alloys), poorly cleaned or exposed plating racks, or the water itself.
Heavy metals that are of special concern include, but are notFile Size: KB. S.B. Lyon, in Shreir's Corrosion, Lead alloys. Of the elements commonly found in lead alloys, zinc and bismuth aggravate corrosion in most circumstances, while additions of copper, tellurium, antimony, nickel, silver, tin, arsenic, and calcium affect corrosion resistance only slightly, or may even improve it depending on the service conditions.
In laboratory studies the dissolution of iron in dilute nitric - hydrochloric acid mixtures shows an apparent reaction order of with respect to HCl.
No apparent order value for HNO/sub 3/ can be determined over the concentration ranges studied. Nickel dissolutions show apparent orders of with respect to the HCl and for HNO/sub 3/. atomic diameter than nickel. These trends may be due to differences in whole alloy compositions and not solely to the presence of iron.
A systematic investigation of iron reductions in a nickel-iron base system has not been reported. It was anticipated that the effect of replacing iron with nickel would. Effect of residual elements on high performance nickel base supera lloys for gas turbines and strategies for manufacture O P SINHA*, M CH ATTERJEE, V V R S SARMA and S N JHA Mishra Dhatu Nigam Limited, P.O.
Kanchanbagh, H yderabadIndia Abstract. In controlled in-vitro experiments, it was concluded that dissolution of titanium alloys is to be considered as the source of the metal ions, which can also lead to toxicity.
A study by Rodrigues et al. suggested that acidic environments that are generated by the bacterial biofilms or/and inflammatory processes might lead to titanium surface Cited by: 8.
and Passivation of Copper-Nickel Alloys in Sodium Sulfate Solutions especially in the presence of chloride ions However, little work has been reported concerning either the electrochemical behavior of the alloys in chloride-free neutral solutions or the effect of the ratio of metallic components on the behavior of the alloy The Author: K.M.
Ismail, A.M. Fathi, W.A. Badawy. Lead-Base Alloys. Because lead is very soft and ductile, it is normally used Commercially as lead alloys. Antimony, tin, arsenic, and calcium are the most common alloying elements.
Antimony generally is used to give greater hardness and strength, as in storage battery grids, sheet, pipe, and castings.
The influence of indium content on the anodic behaviour of Pb-In alloys in 4 M H 2 SO 4 solution is investigated by potentiodynamic, potentiostatic, chronopotentiometric, and cyclic voltammetric techniques. The composition and microstructure of the corrosion layer on Pb-In alloys are characterized by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy analysis (EDX), and scanning Cited by: 2.
Nickel-Containing Alloys in Organic Acids and Related Compounds Table of Contents PART I. INTRODUCTION A. The Organic Acids 4 B. Scope 4 C. Corrosion Testing in Organic Acid Media 4 PART II. ACETIC ACID A. General 5 B. Austenitic Stainless Steels 5 1. General 5 2. Effect of Alloy Composition 6 3.
Effect of Contaminants 10 4. The effect of alloying copper with tin, zinc, silver, nickel, silicon, etc. on properties such as strength, thermal conductivity, color, and electrical conductivity is described. Property data for over copper, brasses, and bronzes is available. between the two alloys (F =df [1, 29]).
The pH value, however, had a significant (P = ) effect on total ion release, as fewer total ions were released at pH 5 compared with pH 4 and pH 7 (F =df [2, 29]).
Chromium is present in both alloys so its release gives an indication of the effect of the alloy on ion release. Overall. FUNDAMENTAL ASPECTS OF CORROSION OF METALLIC MATERIALS P. Marcus and V.
Maurice Laboratoire de Physico-Chimie des Surfaces, CNRS; Université Pierre et Marie Curie, Ecole Nationale Supérieure de Chimie, Paris, France Keywords: Metals, Alloys, Surface, Corrosion, Anodic dissolution, Passivation, Pitting.
Aluminium metal dissolves in plain hydrochloric acid, but the reaction is very slow at start (due to passivating Al2O3).
Some metals greatly catalyse the rate of attack. A well known example is. By using an electrochemical method, ICP (Inductive Coupled Plasma) atomic emission spectrometry and AES (Auger Electron Spectroscopy), the dissolution behavior and film compositions of pure copper, Cu-Ni alloys (10%Ni, 30%Ni and 42%Ni), and pure nickel under one-hour oxidation condition have been investigated in kmol/m 3 ammonium acetate solution of pH at room temperature.
Figure SIMS profiles after caustic dissolution of % Al for min. 63 Figure SIMS profiles of as-electropolished 4N Al foil. 65 Figure D-depth profiles after alkaline dissolution of 4N Al foil normalized with respect to bulk Al 2-counts.
67 Figure AlD-depth profiles after alkaline dissolution of 4N Al foil normalized.Solidification shrinkage in copper-lead base alloys Investigations on copper-lead base alloys show a miscibility gap between copper-rich and lead-rich melts This creates a monotectic reaction in which a lead-rich liquid is formed.
Investigations on the Cu-Pb system shows that the monotectic alloy becomes solid copper (α-phase) and.Nickel-based metals, alloyed with Cr, Mo, W and other elements, are widely used in concentrated acidic solutions because of their excellent corrosion resistance in both oxidizing and reducing environments .The presence of sufficient Cr in Ni alloys enforces the growth of a passive barrier oxide layer of Cr 2 O 3 on the surface, and Mo and W retard the propagation of localized corrosion if.