Comparison of Several Accelerated Laboratory Tests for the Determination of Localized Corrosion Resistance of High-Performance Alloys

CORROSION ◽  
1983 ◽  
Vol 39 (3) ◽  
pp. 98-102 ◽  
Author(s):  
P. E. Manning
Keyword(s):  
Corrosion Resistance ◽  
High Performance ◽  
Laboratory Tests ◽  
Test Procedure ◽  
Localized Corrosion ◽  
Test Results ◽  
Ferric Ions ◽  
Nickel Base ◽  
Temperature Test

Abstract Results of immersion pitting, immersion crevice, and slow scan potentiodynamic pitting tests are compared to assess the relevance of particular types of accelerated laboratory tests for localized corrosion. The alloys examined include 317 L, 20-type alloys, duplex stainless steels, and nickel-base alloys. The solutions utilized are acid chloride-type with and without ferric ions [Fe2(SO4)3] as an oxidizing species. The acids examined include sulfuric, hydrochloric, and mixtures of these two acids. The best accelerated test for rating localized corrosion resistance of alloys is the immersion pitting temperature test. Results from this test procedure best simulate and correlate with the service performance of alloys.

ELECTRALLOY ALLOY ECHX

Alloy Digest ◽  
2010 ◽  
Vol 59 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
High Performance ◽  
Stress Rupture ◽  
Heat Treating ◽  
Stress Rupture Properties ◽  
Nickel Base ◽  
Gaseous Corrosion ◽  
Rupture Properties

Abstract Electralloy ECHX is a solution-strengthened, nickel-base, high-performance alloy providing excellent resistance to high-temperature gaseous corrosion, coupled with good strength and stress rupture properties up to 1205 deg C (2200 deg F). This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-678. Producer or source: Electralloy, a Division of G.O. Carlson Inc.

Opportunities of innovative biomedical technologies in high performance sport

2015 ◽  
Vol 9 (1) ◽  
pp. 0-0 ◽  
Author(s):  
Фудин ◽  
N. Fudin ◽  
Хадарцев ◽  
Aleksandr Khadartsev
Keyword(s):  
Liquid Chromatography ◽  
Emotional Stress ◽  
High Performance ◽  
Laboratory Tests ◽  
Biochemical Laboratory ◽  
Biomedical Technologies

The authors give an explanation of individually dosed heat-cold treatments in combination with electro laser myostimulation and external contre-pulsation carried out at 70 athletes aged 28-32 years involved in cyclic sports. The results of clinical and biochemical laboratory tests, determination of adrenaline and noradrenaline by liquid chromatography, the content of vitamins and betacarotene - demonstrated normalization of auto-nomic functions, such as reducing the signs of emotional stress.

Effect of Alloy Composition on the Localized Corrosion Resistance of Nickel Alloys

2012 ◽  
Vol 1475 ◽  
Author(s):  
Santiago Sosa Haudet ◽  
Martín A. Rodríguez ◽  
Ricardo M. Carranza
Keyword(s):  
Corrosion Resistance ◽  
Crevice Corrosion ◽  
Chloride Concentration ◽  
Testing Temperature ◽  
Localized Corrosion ◽  
Chloride Solutions ◽  
Equivalent Number ◽  
Engineered Barriers ◽  
Nickel Base ◽  
30 G 35

ABSTRACTNickel base alloys are considered among candidate materials for engineered barriers of nuclear repositories. The localized corrosion resistance is a determining factor in the materials selection for this application. This work compares the crevice corrosion resistance of selected nickel base alloys, namely 625, G-30, G-35, C-22, C-22HS and HYBRID-BC1. The crevice corrosion repassivation potential (ER,CREV) of the tested alloys was determined by the Potentiodynamic-Galvanostatic-Potentiodynamic (PD-GS-PD) method. The testing temperature was 60ºC and the chloride concentrations used were 0.1 M, 1 M and 10 M.A linear relationship between ER,CREV and the logarithm of chloride concentration was found. ER,CREV increased linearly with PREN (Pitting Resistance Equivalent Number) in concentrated chloride solutions. ER,CREV is the sum of three contributions: ECORR*, η and ΔΦ. ECORR* and η increased linearly with PREN, while ΔΦ increased linearly with PREN for concentrated chloride solutions, not showing a definite trend with PREN for the less concentrated solutions.

Charpy V notch tests – Risks associated with testing with 3 samples

2021 ◽  
Vol 109 (1) ◽  
pp. 105
Author(s):  
Michel Huther ◽  
Henri-Paul Lieurade
Keyword(s):  
Test Procedure ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Test Method ◽  
Transition Curve ◽  
Test Results ◽  
Working Groups ◽  
Temperature Work ◽  
Work Done

To estimate the risk of brittle fracture of a component in service, Charpy tests are generally carried out on 3 samples at the same temperature. Work done over many years on welded joint fatigue using probability and statistics has shown that to have a good assessment of minimum strength, it is clearly necessary to have a larger number of test results. In order to analyse the risks associated with this practice of 3 samples tested at the same temperature, a series of 17 Charpy impact test results of samples of the same steel plate was chosen. From this series, by translation, 2 series were generated, one with a test of 3 specimens showing acceptable steel and one with a test of 3 specimens showing unacceptable steel. The 3-test method was applied to these series leading to a possible simulation of 12 tests each. It was found that the 3-test practice leads to a risk of error of 30 to 40%. It is also found that the determination of the transition curve of a DH36 steel finally shows that its temperature for a CV of 27 J is of the order of −50 °C whereas the regulations require only −20 °C. In conclusion, a possible improvement of the test procedure is indicated, which is the subject of a study within the framework of the “CCRS rupture and fatigue” working groups of the Société des Ingénieurs Soudeurs (SIS).

scholarly journals Determination of Glucosamine in Raw Materials and Dietary Supplements Containing Glucosamine Sulfate and/or Glucosamine Hydrochloride by High-Performance Liquid Chromatography with FMOC-Su Derivatization: Collaborative Study

2005 ◽  
Vol 88 (4) ◽  
pp. 1048-1058 ◽  
Author(s):  
Joseph Ziqi Zhou ◽  
Ted Waszkuc ◽  
Felicia Mohammed ◽  
M Blumhorst ◽  
R Buren ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Dietary Supplements ◽  
High Performance ◽  
Raw Materials ◽  
Collaborative Study ◽  
Test Results ◽  
Commercial Products ◽  
Glucosamine Hydrochloride

Abstract A collaborative study was conducted for determination of glucosamine in raw materials and dietary supplements containing glucosamine sulfate and/or glucosamine hydrochloride by high-performance liquid chromatography (HPLC) with N-(9-fluorenyl-methoxycarbonyloxy) succinimide (FMOC-Su) derivatization. Thirteen blind materials, one pair of which were duplicates, were tested by 12 collaborating laboratories. The test samples consisted of various commercial products, including tablets, capsules, drink mix, and liquids as well as raw materials, blanks, and those for spike recovery analyses. The tests with blank products and products spiked with glucosamine showed good specificity of the method. The average recoveries at spike levels of 100 and 150% of the declared amount were 99.0% with a relative standard deviation (RSD) of 2.1%, and 101% with an RSD of 2.3%, respectively. The test results between laboratories on each commercial product were reproducible with RSD values of no more than 4.0%, and the results were repeatable in the same laboratory with an average RSD of 0.7%. HorRat values ranged from 0.5 to 1.7 on both tests of spike recovery and reproducibility between laboratories on commercial products. The average determination coefficient of the calibration curves from the laboratories was 0.9995 with an RSD of 0.03%. All of the 12 collaborating laboratories succeeded in the study and none of their reported test results were outliers, partly indicating the robustness of the method. It is recommended that the method be accepted by AOAC INTERNATIONAL as Official First Action.

Metals at High Temperature—Test Procedure and Analysis of Test Data

1933 ◽  
Vol 1 (3) ◽  
pp. 145-148
Author(s):  
Ernest L. Robinson
Keyword(s):  
High Temperature ◽  
Applied Stress ◽  
High Temperatures ◽  
Test Data ◽  
Test Procedure ◽  
Test Results ◽  
Allowable Stress ◽  
Actual Service ◽  
Second Year ◽  
Temperature Test

Abstract Tests on the flow of metals at high temperatures under stresses so small that the resulting distortions are less than one-tenth of 1 per cent show, throughout the duration of tests extending into the second year, continued reductions in rates of flow so that, for such small distortions, it is impossible to associate any particular rate of flow with a corresponding allowable stress. A statement of test results, to be of use, requires in addition to rate of flow and applied stress, certainly a record of total extension and possibly also a record of time elapsed. Furthermore, tests should be made under conditions of stress approximating the conditions of application in actual service.

scholarly journals Determination of Turbine Stage Performance for an Automotive Power Plant

1957 ◽  
Author(s):  
L. B. Mann ◽  
A. H. Bell ◽  
G. W. Thebert
Keyword(s):  
Experimental Investigation ◽  
Power Plant ◽  
Test Procedure ◽  
Test Facility ◽  
Test Results ◽  
Turbine Stage ◽  
Component Test ◽  
Stage Performance ◽  
Working Parameters

The experimental investigation of turbine-stage performance in a component test facility is presented. The test variables are combined into working parameters and these are used to develop a convenient test procedure. Fixture equipment, specialized instrumentation and the related methods are discussed. Test results from a typical automotive turbine stage are presented.

scholarly journals Application of HPLC for Evaluation and Standardisation of Hawthorn Flower Herbal Substance

2019 ◽  
Vol 9 (3) ◽  
pp. 177-183
Author(s):  
N. P. Antonova ◽  
E. P. Shefer ◽  
N. E. Semenova ◽  
A. M. Kalinin ◽  
S. S. Prokhvatilova ◽  
...  
Keyword(s):  
Quantitative Determination ◽  
Russian Federation ◽  
High Performance ◽  
Primary Standard ◽  
Test Procedure ◽  
Total Content ◽  
The State ◽  
Assay Method ◽  
The Russian Federation

The process of harmonisation of Russian and foreign approaches and requirements in the field of medicines quality assurance calls for revision of quality control procedures included in various regulations and guidelines. The monograph FS.2.5.0062.18 “Hawthorn flowers” of the State Pharmacopoeia of the Russian Federation XIV edition includes a test procedure for determination of flavonoids by a chromatospectrophotometric method. This procedure does not take into account current scientific capabilities and has a number of shortcomings, therefore it was necessary to revise the existing test procedure and develop a new approach to the standardisation of the hawthorn flower herbal substance.The objective of the study was to develop an assay method for standardisation and evaluation of hawthorn flower using high performance liquid chromatography (HPLC).Materials and methods: the study was performed using samples of hawthorn flowers by Russian manufacturers. Quercetin (USP RS) and Hyperoside (HWI, primary standard) were used as the reference standards. The HPLC analysis was performed using an Infinity II 1260 DAD LC system (Agilent), and the UV spectra were recorded on a Cary 100 Varian spectrophotometer. A TLC Visualizer (CAMAG) was used to obtain digital images of thin layer chromatography plates.Results: the authors developed an HPLC test procedure for quantitative determination of total flavonoids, expressed as hyperoside, in hawthorn flowers. The developed procedure gives reliable and reproducible results and is characterised by high sensitivity and selectivity. The results of quantitative determination of the total flavonoid content in hawthorn flowers were used to propose the standard for the total content of flavonoids, expressed as hyperoside, of “not less than 0.5%”.Conclusions: the developed assay method for determination of active pharmaceutical ingredients in hawthorn flower products by HPLC can be recommended for inclusion into the Assay part of the “Hawthorn Flowers” monograph of the State Pharmacopoeia of the Russian Federation.

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