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Magnesium Anode Magnesium Anode for Grounding Grid
Whether in seawater, on offshore platforms or in oil and gas pipelines, magnesium alloy sacrificial anodes can effectively play their anti - corrosion role.
The emergence of magnesium alloy sacrificial anodes provides a reliable solution for engineering anti - corrosion.
Output Current of Sacrificial Anode
1. Standard Resistance Method: When there is a 0.1 - ohm or 0.01 - ohm standard resistance in the test range, the output current of the sacrificial anode (group) can be measured by the standard resistance method. Measurement method: First, connect the wires according to the wiring requirements of the standard resistance method. Second, connect the two current terminals of the standard resistance to the terminals of the pipeline and the sacrificial anode respectively, and connect the two potential terminals to a digital multimeter. Set the digital multimeter to the lowest DC voltage range. The total length of the connected wires should not be greater than 1 meter, and the cross - sectional area should not be less than 2.5 square millimeters. Third, the resistance value of the standard resistance is preferably 0.1 ohm with an accuracy of 0.02 level. To obtain more accurate measurement results, the standard resistance can be 0.01 ohm. In this case, the resolution of the DC voltage range of the digital multimeter used should not be greater than 0.01 millivolt. Fourth, data processing: The calculation method of the output current of the sacrificial anode is: the output current (milliamperes) of the sacrificial anode (group) is equal to the reading of the digital multimeter (milliamperes) divided by the resistance value of the standard resistance (ohms).
2. Direct Measurement Method The output current of the sacrificial anode (group) can also be measured by the direct measurement method. Measurement method: First, connect the wires according to the wiring requirements of the direct measurement method. Second, use a digital multimeter to directly read the current value. Third, use an inductive ammeter to directly measure the output current of the anode.
1) Valves on buried pipelines with poor anti - corrosion coatings or no anti - corrosion coatings at all;
(2) Short casings or parts where the coating has been severely damaged;
(3) Areas where electrical shielding occurs. In this area, the effective current from the remote impressed current system has been weakened;
(4) If anode interference occurs in a suitable environment, sacrificial anodes can be used at the drainage points of the pipeline to return the interfering current flowing into the pipeline to the interference current source.
(5) For areas with many and complex buried structures, it is very difficult to use impressed current cathodic protection without interfering with adjacent structures. For structures in such an environment, the sacrificial anode method is a more economical choice.
(6) Sacrificial anodes are widely used for the protection of the inner walls of heat exchangers and other containers. The protection effect depends on the quality of the lining, the flow and temperature of the medium.
(7) For deep - sea structures, large sacrificial anodes can be used to protect underwater components.
(8) A certain number of zinc blocks are installed on the stern of the ship and the part of the hull below the waterline to prevent corrosion of the hull, etc.
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