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