Stress corrosion test apparatus

Abstract

The invention discloses a stress corrosion test apparatus. The apparatus comprises a stress corrosion container (1), a spherical condenser (2), a tensile test specimen (3), a salt bridge 1 (4), a wide-mouth bottle (5), a salt bridge 2 (6), a reference electrode (7), a platinum electrode, a computer (8), an electrochemical workstation (9), a electric stove wire (10), a thermoelectric thermometer (11), a temperature controller (12), an alternating-current transformer (13), etc. The apparatus can provide tensile tests capable of being used for metals in a corrosive medium with controllable temperature and capable of being externally applied corrosion current. The temperature of the corrosion medium is controlled by the electric stove wire and a temperature-control system. The reference electrode, the platinum electrode and the tensile test specimen constitute a voltage circuit and a current circuit respectively to control the corrosion potential and current additionally applied on the test specimen or generated on a monitoring sample. A normal temperature reference electrode rather than a high temperature reference electrode can be used for the measurement of the potential by connecting the reference electrode, the wide-mouth bottle and the stress corrosion container with the salt bridges.

Description

technical field [0001] The invention relates to a stress corrosion test device, which belongs to the improvement technology of the tensile stress corrosion device. Background technique [0002] In the metal corrosion test, the stress corrosion test is an important content. There are many stress corrosion test methods. Stress Corrosion Test in Magnesium Chloride Solution" explains the stress corrosion test method. Among them, the slow strain rate test method has the advantage of being able to quickly evaluate the sensitivity of stress corrosion cracking. In these two national standard test methods, the corrosive medium can be heated, but Potential and current cannot be applied and detected. [0003] At present, the three-electrode system is commonly used in electrochemical testing, including working electrode (sample), reference electrode (calomel electrode, silver chloride electrode, copper sulfate electrode, etc. commonly used in laboratories), auxiliary electrode (platinu...

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Problems solved by technology

[0002] In the metal corrosion test, the stress corrosion test is an important content. There are many stress corrosion test methods. Stress Corrosion Test in Magnesium Chloride Solution" explains the stress corrosion test method. Among them, the slow strain rate test method has the advantage of being able to quickly evaluate the sensitivity of stress corrosion cracking. In these two national standard test methods, the corrosive medium can be heated, but Unable to apply and detect potential and current

[0003] At present, the three-electrode system is commonly used in electrochemical testing, including working electrode (sample), reference electrode (calomel electrode, silver chloride electrode, copper sulfate electrode, etc. commonly used in laboratories), auxiliary electrode (platinum electrode, graphite electrode, etc. electrode, etc.), the medium in these reference electrodes is aqueous solution, which is suitable for testing the potential at room temperature, but there are few types of reference electrodes suitable for measuring higher than 50 ° C, which need to be customized, expensive, easy to damage and long service life short

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