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repassivation

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Published: 01 January 2005
Fig. 22 Repassivation potentials for nickel alloys in 1 M NaCl (triangle), 1 M NaBr (square), 1 M NaF (circle), and 1 M NaI (diamond). Cyclic polarization at 50 °C (122 °F) and 0.5 mV/s More
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Published: 01 January 2005
Fig. 14 Changes in the median pitting ( E pit ) and repassivation ( E rp ) potentials of Al 90 Fe 5 Gd 5 with devitrification. E pit and E rp for polycrystalline and single-crystal 99.999% Al are included for comparison. Source: Ref 118 More
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Published: 01 January 2006
Fig. 40 Cathodic protection (CP) of reinforcement can lead to repassivation of the rebar when chloride ions migrate from rebar and/or realkalization of the concrete surrounding the rebar occurs. Under these conditions, the CP can be removed. The rebar will depolarize and return to passive More
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Published: 01 January 2006
Fig. 1 Pitting and repassivation potential of pure tantalum as a function of water concentration (0–4 wt%) in methanol solutions. 99.5–95.5 wt% MeOH. 0.5 wt% HCl. Room temperature, N 2 purge More
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Published: 01 January 2003
Fig. 4 Pitting (filled symbols) and repassivation (open symbols) in 1 M NaCl as a function of temperature for different grades of stainless steel. SCE, saturated calomel electrode. Source: Ref 40 More
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Published: 01 January 2003
Fig. 11 The repassivation potential of alloy 825 as a function of prior crevice corrosion and pit depth. The results show a bounding value independent of penetration depth. Test conditions: 1000 ppm Cl − at 95 °C (200 °F); back scan, 5 mV/s. Source: Ref 39 More
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004103
EISBN: 978-1-62708-184-9
... information on the surface finish of pharmaceutical equipment. It discusses the classification of rouge and the characteristics of cast type 316L stainless steel. The article also explains how and when to perform cleaning and repassivation process on classes of rouge. corrosion corrosion resistance...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003677
EISBN: 978-1-62708-182-5
... alloys. The article also illustrates the effects of alloying on active anodic corrosion of titanium and repassivation behavior of titanium and titanium-base alloys. titanium oxide film titanium oxide depassivation scratching abrading fretting titanium alloys hexagonal close-packed beta...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003586
EISBN: 978-1-62708-182-5
... methods, frequency modulation methods, electrochemical noise resistance, potential probe methods, cyclic potentiodynamic polarization methods, potentiostatic and galvanostatic methods, electrochemical noise (EN) methods, scratch-repassivation method, and electrochemical impedance spectroscopy (EIS...
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Published: 01 January 2003
Fig. 9 Potential versus time plot of scratch test illustrating a possible location of the critical potential, E c , as it relates to the induction time and the repassivation time. Source: Ref 86 More
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Published: 01 January 2003
Fig. 3 Schematic of a polarization curve showing critical potentials and metastable pitting region. E P , pitting potential; E R , repassivation potential; E corr , corrosion potential. Source: Ref 1 More
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Published: 01 January 2006
Fig. 3 Cyclic potentiodynamic polarization for alloy 22 (UNS N06022) in deaerated 5 M CaCl 2 solutions at different temperatures. The higher the temperature, the lower the breakdown potential ( E 200) or repassivation potential ( E R1) More
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Published: 01 October 2014
Fig. 21 Polarization curves for AISI 316 in as-delivered and low-temperature nitrocarburized state. Measurement was carried out in an aqueous 3.5% NaCl solution at room temperature. For the nitrocarburized sample repassivation occurs in the transpassive region, indication that the material More
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Published: 01 January 2006
Fig. 28 Observed and theoretical crack-propagation rate versus crack-tip strain-rate relationships for sensitized type 304 stainless steel in oxygenated water at 288 °C (550 °F). EPR, electrochemical potentiokinetic repassivation. Source: Ref 38 , 59 More
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Published: 01 January 2006
Fig. 27 Relationships between n in Eq 6 and 7 and the corrosion potential and bulk solution conductivity for a sensitized (EPR=15 C/cm 2 ) type 304 stainless steel in water at 288 °C (550 °F). EPR, electrochemical potentiokinetic repassivation. Source: Ref 38 More
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Published: 01 January 2003
Fig. 3 Galvanic current densities of three creviced specimens of welded stainless steel (UNS S31254) and a cathode as a function of time in seawater at 15 °C (59 °F). This illustrates that repassivation occurs in approximately 10 to 20 days. Source: Ref 27 , with permission from NACE More
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Published: 01 January 2003
Fig. 9 Effects of applied potential and corrosion potential on the pitting- and crevice-corrosion initiation time for alloy 825 in 1000 ppm Cl − at 95 °C (203 °F). Note that at and below the repassivation potential, E rp no initiation occurs out to at least three years. Source: Ref 39 More
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Published: 01 January 1996
Fig. 5 Oxidation current density vs. time following rupture of the protective oxide on a stainless steel wire by rapid straining in hot water. A high-peak (bare-surface) current density (generally ≥ 1 A/cm 2 , corresponding to rapid metal dissolution) is followed by repassivation More
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Published: 01 January 2006
Fig. 4 Parameters from cyclic potentiodynamic polarization for alloy 22 (UNS N06022) in deaerated 5 M CaCl 2 and in 5 M CaCl 2 +Ca(NO 3 ) 2 solutions as a function of temperature. At each temperature (for example at 75 °C, or 165 °F), the repassivation potential ( E R1) is raised when More
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003612
EISBN: 978-1-62708-182-5
... oxygen; enriched in metal cation and an anionic species, such as chloride; and acidified. This acidic chloride environment is aggressive to most metals and tends to prevent repassivation and promote continued propagation of the pit. A detailed analysis of the influence of pit chemistry changes on pit...