BS EN ISO 17081:2008
$142.49
Method of measurement of hydrogen permeation and determination of hydrogen uptake and transport in metals by an electrochemical technique
| Published By | Publication Date | Number of Pages |
| BSI | 2008 | 24 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 5 | TableofContent – Contents Page |
| 6 | Foreword – Foreword |
| 7 | Scope – 1��� Scope UntitledSubclause2 – 1.1��� This International Standard UntitledSubclause2 – 1.2��� This International Standard UntitledSubclause2 – 1.3��� This International Standard UntitledSubclause2 – 1.4��� This International Standard NormativeReference – 2��� Normative references |
| 9 | Clause1 – 4��� Symbols Clause1 – 5��� Principle UntitledSubclause2 – 5.1��� The technique involves locating the metal sample of interest between … UntitledSubclause2 – 5.2��� In gaseous environments, the hydrogen atoms are generated by adsorpti… UntitledSubclause2 – 5.3��� The environment and the electrode potential on the oxidation side of … |
| 10 | UntitledSubclause2 – 5.4��� The electrode potential of the sample in the oxidation cell is contro… UntitledSubclause2 – 5.5��� The oxidation current is monitored as a function of time. The total o… UntitledSubclause2 – 5.6��� The thickness of the sample, UntitledSubclause2 – 5.7��� In reasonably pure metals with a sufficiently low density of microstr… UntitledSubclause2 – 5.8��� The effect of alloying and of microstructural features such as disloc… UntitledSubclause2 – 5.9��� The method may be used for stressed and unstressed samples but testin… Clause1 – 6��� Samples Subclause2 – 6.1��� Dimensions |
| 11 | Subclause2 – 6.2��� Preparation UntitledSubclause3 – 6.2.1��� As hydrogen atom permeation can be influenced by microstructural or… UntitledSubclause3 – 6.2.2��� Samples shall be prepared using one of the following methods: UntitledSubclause3 – 6.2.3��� Sheet samples shall be machined to the required thickness. Care sha… UntitledSubclause3 – 6.2.4��� The thickness of the sample in the region of interest shall be as u… UntitledSubclause3 – 6.2.5��� The oxidation side of the sample shall be mechanically ground or po… UntitledSubclause3 – 6.2.6��� After polishing, traces of polishing chemicals shall be removed by … UntitledSubclause3 – 6.2.7��� The final thickness shall be measured in at least five locations in… UntitledSubclause3 – 6.2.8��� A suitable electrical connection shall be made to the sample remote… UntitledSubclause3 – 6.2.9��� The sample shall be uniquely identified. Stamping or scribing on th… Clause1 – 7��� Apparatus |
| 13 | Clause1 – 8��� Test environment considerations UntitledSubclause2 – 8.1��� The test environment shall be chosen on the basis of one of the follo… UntitledSubclause2 – 8.2��� The environments in the oxidation cell and in the charging cell shall… UntitledSubclause2 – 8.3��� The environment in the oxidation cell shall be prepared using analyti… UntitledSubclause2 – 8.4��� Where the environment in the charging cell is aqueous, the solution s… UntitledSubclause2 – 8.5��� The ratio of volume of solution (in millilitres) to metal area (in sq… UntitledSubclause2 – 8.6��� The solution composition in the charging cell shall be maintained con… UntitledSubclause2 – 8.7��� Where solution flow is relevant to the intended service application, … UntitledSubclause2 – 8.8��� The electrode potential of the sample exposed to the oxidation compar… |
| 14 | UntitledSubclause2 – 8.9��� In aqueous solutions the exposure conditions on the charging side of … UntitledSubclause2 – 8.10��� The location of the reference electrode in each compartment shall en… UntitledSubclause2 – 8.11��� As the temperature of the solution can have a significant effect on … Clause1 – 9��� Test procedure UntitledSubclause2 – 9.1��� Prepare the test sample to the required surface finish and measure th… UntitledSubclause2 – 9.2��� Prepare the solutions and carry out pre-electrolysis where further pu… UntitledSubclause2 – 9.3��� Measure the pH of the solutions where appropriate (see UntitledSubclause2 – 9.4��� Verify the accuracy of the reference electrodes to UntitledSubclause2 – 9.5��� Construct the two-compartment cell, using seals as appropriate. UntitledSubclause2 – 9.6��� Add the solution for the oxidation cell to the relevant chamber and c… UntitledSubclause2 – 9.7��� Once the oxidation current has achieved a steady, low value, add the … |
| 15 | UntitledSubclause2 – 9.8��� Switch on the stirring motors, where used. For non-passivating system… UntitledSubclause2 – 9.9��� Monitor the total oxidation current (comprising background passive cu… UntitledSubclause2 – 9.10��� In order to define the control potential for the system, conduct a p… UntitledSubclause2 – 9.11��� To distinguish the effects of irreversible and reversible trapping o… UntitledSubclause2 – 9.12��� Unless the thickness of the specimen represents a particular service… UntitledSubclause2 – 9.13��� Measure the final pH of the solutions, where appropriate (see UntitledSubclause2 – 9.14��� Where significant corrosion has occurred, measure the final thicknes… UntitledSubclause2 – 9.15��� Conduct replicate tests to determine the repeatability of the method… Clause1 – 10��� Control and monitoring of test environment UntitledSubclause2 – 10.1��� In near-neutral unbuffered solutions, pH changes can occur and the p… |
| 16 | UntitledSubclause2 – 10.2��� For reliable interpretation of hydrogen permeation transients, the s… UntitledSubclause2 – 10.3��� In some applications, corrosion products or films may develop and in… UntitledSubclause2 – 10.4��� For tests in which H UntitledSubclause2 – 10.5��� For tests using other recombination poisons, it is recommended that … Clause1 – 11��� Analysis of results Subclause2 – 11.1��� General Subclause2 – 11.2��� Analysis of steady-state current Subclause2 – 11.3��� Analysis of permeation transient UntitledSubclause3 – 11.3.1��� To calculate the effective diffusion coefficient based on the elap… |
| 17 | UntitledSubclause3 – 11.3.2��� The values for UntitledSubclause3 – 11.3.3��� To verify the applicability of Fick’s second law to the permeation… |
| 18 | UntitledSubclause3 – 11.3.4��� If volume-controlled transport is of primary interest, UntitledSubclause3 – 11.3.5��� To evaluate the extent of reversible and irreversible trapping, co… |
| 19 | UntitledSubclause3 – 11.3.6��� In the absence of void formation, second and subsequent transients… Clause1 – 12��� Test report |
| 20 | AnnexInformative – Recommended test environments for specific alloys Clause1 – A.1��� General Clause1 – A.2��� Stainless steels Subclause2 – A.2.1��� Martensitic stainless steel Subclause2 – A.2.2��� Duplex ferritic austenitic stainless steel Subclause2 – A.2.3��� Austenitic stainless steel Clause1 – A.3��� Nickel alloys |
| 21 | Clause1 – A.4��� Carbon, carbon-manganese and low alloy steels |
| 22 | Bibliography – Bibliography |
