RU154475U1 - DEVICE FOR CHECKING THE CORRECTNESS OF INDICATIONS OF CHLORESEBAR ELECTRODES OF COMPARISON - Google Patents

Abstract

A device for checking the accuracy of silver chloride comparison electrodes, including a test electrode, a millivoltmeter, a vessel with a 3% solution of sodium chloride, characterized in that it contains at least two control electrodes made in the form of carbon products.

Description

The utility model relates to technical means designed to protect ships and ships from corrosion and can be used in the operation and commissioning of electrochemical protection systems for steel hulls of ships and ships.

A device is known [1, C. 9] for testing the performance of silver chloride reference electrodes, including a test electrode and a millivoltmeter. The performance of the electrode is checked by measuring the stationary potential of the steel body of the object with the electrochemical protection system turned off. The value of the stationary potential of steel bodies in water of various salinity should be minus 0.5 - minus 0.7 V.

This device has the following disadvantages:

- it cannot be used on ships and ships that use short-circuited tread protection, because it cannot be disabled;

- the reliability of the test results is low, because the permissible value of the stationary potential (minus 0.7 V) practically does not differ from the permissible value (minus 0.75 V) of the protective potential of the steel hull of the vessel (ship).

Closest to the proposed device is a device for checking the accuracy of silver chloride reference electrodes [2, C. 338], including a vessel with sea water or a 3% solution of sodium chloride, millivoltmeter, tested silver chloride electrode, reference silver chloride electrode. Using this device, the potential difference between the reference and test electrodes is measured, it should be no more than 20 mV. With a larger potential difference, the tested electrode should be replaced with a new one.

This device has the following disadvantages:

- high operating costs, because as a reference electrode, you just need to use a freshly prepared silver chloride electrode and therefore you need to constantly produce (or purchase) reference electrodes;

- low reliability of the results of checking the accuracy of silver chloride electrodes performed by the crew of the vessel (ship), because on ships and ships there are no freshly prepared silver-silver reference electrodes.

The technical result of the utility model is to reduce operating costs and increase the reliability of the results of checking the accuracy of silver chloride reference electrodes carried out by the crew of the vessel.

The technical result is achieved by the fact that the proposed device for checking the accuracy of silver chloride comparison electrodes including a test electrode, millivoltmeter, a vessel with a 3% sodium chloride solution, characterized in that it contains at least two control electrodes made in the form of carbon products.

The design of the device is shown in FIG. 1. The device contains a vessel 1 made of a dielectric material filled with a 3% solution of sodium chloride 2. A float 3 made of foam is placed on the surface of the solution. The float 3 using fixing devices 4 keeps afloat the control electrodes 5 and 7, made in the form of electric carbon products and the tested silver chloride electrode 6. The potential difference between the tested silver chloride electrode 6 and the control electrodes 5 and 7 is measured using a millivoltmeter 10. Electrodes 5 and 7 connected to the millivoltmeter 10 in turn using switches 8 and 9.

The operation of the device is as follows. Silver chlorine reference electrodes used by the crew to monitor electrochemical protection systems are tested once a year in a specialized laboratory using reference reference electrodes. Then, the ship's crew selects at least two marine carbon products as control electrodes. Using the proposed installation measure the potential difference between the ship silver-silver electrodes and the control electrodes. After that, each control electrode is placed in a sealed steel package, and a control tag with the values of the potential differences between the silver-silver electrode to be checked and the control electrode is placed there. The ship’s crew uses control electrodes for monthly scheduled verification of the results of measurements of the protective potential of steel hulls of ships and vessels. To do this, monthly using the device shown in FIG. 1, the potential difference between the silver chloride reference electrode and the control electrodes (for example, graphite brushes for electric machines) is measured, and the obtained values are compared with the values recorded on the control tag. If the difference between these values exceeds the permissible value (5 mV), then the silver chloride electrode must be replaced. The use of two control electrodes allows to increase the reliability of checking the accuracy of the silver chloride reference electrodes. In addition, the control electrodes can be used by the crew instead of silver chloride reference electrodes, in case of failure of the latter. In this case, introducing into the measurement results of the protective potential a correction equal to the potential difference between the silver chloride reference electrode and the control electrode, the value of which is written on the control tag.

Using the proposed device provides in comparison with currently used devices the following advantages:

- the possibility of using it on any ships and ships, including objects where short-circuited tread protection is used;

- increases the reliability of the results of checking the accuracy of the silver chloride reference electrodes performed by the crew of the vessel or ship;

- reduces the cost of checking the accuracy of the silver chloride reference electrodes performed by the crew;

- increases the effectiveness of control systems of electrochemical protection.

The proposed device is advisable to use on fishing, transport, passenger and auxiliary vessels, as well as on special vessels.

Information sources:

1. GOST 9.056-75 Steel hulls of ships and ships. General requirements for electrochemical protection during long-term parking. - M .: USSR State Committee for Standards. - 15 p.

2. Guidelines for the protection of hulls of surface ships of the Navy against corrosion and fouling. - M.: Military Publishing House, 1984. - 351 p.

Claims (1)

A device for checking the accuracy of silver chloride comparison electrodes, including a test electrode, a millivoltmeter, a vessel with a 3% solution of sodium chloride, characterized in that it contains at least two control electrodes made in the form of carbon products.

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