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BS ISO 15724:2001 Metallic and other inorganic coatings. Electrochemical measurement of diffusible hydrogen in steels. Barnacle electrode method, 2001
- 30058713.pdf [Go to Page]
- Metallic and other inorganic coatings�— Electrochemical measurement of diffusible hydrogen in ste...
- Contents Page
- Foreword
- Introduction
- Metallic and other inorganic coatings�— Electrochemical measurement of diffusible hydrogen in ste... [Go to Page]
- 1��� Scope
- 2��� Normative references
- 3��� Principle
- 4��� Reagents [Go to Page]
- 4.1��� Electrolyte
- 4.2��� Methyl alcohol
- 4.3��� Ethyl alcohol
- 5��� Apparatus [Go to Page]
- 5.1��� The barnacle electrode system [Go to Page]
- 5.1.1��� cell
- 5.1.2��� gasket
- 5.1.3��� cell holder
- 5.1.4��� anode
- 5.1.5��� cathode
- 5.1.6��� a current measuring device
- 5.2��� Microscope
- 5.3��� Nylon cleaning pad
- 6��� Test specimens
- 7��� Calibration [Go to Page]
- 7.1��� Calibrate the Ni/NiO electrode (
- 7.2��� Charge the Ni/NiO electrode using a platinum, or similar, inert electrode as the cathode a...
- 7.3��� Calculate the cell contact area outlined by the gasket as follows.
- 7.4��� Measure the background current density by using uncoated specimens containing no hydrogen,...
- 8��� Procedure [Go to Page]
- 8.1��� Specimen preparation [Go to Page]
- 8.1.1��� The procedure for preparation of the specimen for testing depends on whether it is plate...
- 8.1.2��� For unplated specimens, abrade the surface lightly with an aluminium oxide impregnated n...
- 8.1.3��� For plated specimens with post-plating heat treatment (see
- 8.2��� Cell assembly [Go to Page]
- 8.2.1��� The time to assemble the cell and the commencement of measurement shall take no longer than
- 8.2.2��� Clamp the cell to the specimen just tightly enough to prevent leakage (see
- 8.2.3��� Insert the Ni/NiO electrode in the centre of the cell cavity. Ensure that there is no di...
- 8.2.4��� Connect the resistance and the switch between the Ni/NiO electrode and the specimen (see
- 8.2.5��� Connect the electrometer across the resistance so that the Ni/NiO electrode will measure...
- 8.2.6��� Connect the recorder (
- 8.2.7��� Fill the cell with
- 8.3��� Current measurement [Go to Page]
- 8.3.1��� Measurement of the current shall commence within
- 8.3.2��� Turn on the cell switch and activate the timer simultaneously.
- 8.3.3��� Record the current for
- 8.3.4��� Turn off the switch.
- 8.3.5��� Dismantle the cell, rinse and dry.
- 8.3.6��� Repeat the measurement (
- 8.3.7��� If a series of measurements is to be made during the day, alternate Ni/NiO electrodes an...
- 9��� Results [Go to Page]
- 9.1��� Calculate the current from the voltage drop across the standard resistance using Ohm's Law,
- 9.2��� Calculate the contact area from the diameter of the etched surface area (see
- 9.3��� Calculate the current density; e.g., if the
- 10��� Interpretation of results [Go to Page]
- 10.1��� Irregular recorder tracings (
- 10.2��� A measurement higher than the background current density indicates the presence of hydrog...
- 10.3��� Care shall be taken in inferring hydrogen levels over the whole part from limited measure...
- 10.4��� As the measurement is relatively rapid, it measures hydrogen that diffuses easily. It is,...
- 11��� Test report
- Bibliography [Go to Page]