Method for preparing long-acting solid zinc reference electrode used in soil
A reference electrode and soil technology, which is applied in the field of preparation of long-term solid zinc reference electrodes, can solve problems such as failure, instability, and easy leakage of reference electrodes, and achieve the effect of overcoming leakage and failure and improving stability
Inactive Publication Date: 2011-07-13
TIANJIN UNIV
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Problems solved by technology
[0005] The purpose of the present invention is to avoid the problem that the Cu / CuSO4 reference electrode is easy to leak and fail, overcome the shortcomings of the newly made zinc electrode in the soil, the initial potential drift is large and unstable, and adopt the industrial pure zinc reference electrode in a certain The method of anodic oxidation treatment under a certain polarization current improves the stability of the electrode potential and provides an industrially pure zinc reference electrode with stable potential that can be practically applied in soil
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Embodiment Construction
[0021] The specific preparation method of the long-acting solid zinc reference electrode for corrosion testing in soil of the present invention is as follows.
[0022] Preparation of zinc reference electrode: select industrial pure zinc with a material size of 20mmX10mmX5mm, melt and cast it into a shape for use. Grind in sequence with 120#-600# water abrasive paper, rinse with tap water and distilled water, and then scrub with acetone, connect the wires, seal the connecting wires, and seal the non-working surface with rosin paraffin liquid. The effective working area of the electrode is 0.50cm 2 ;
[0023] Bury the zinc electrode into the soil, and inject a small amount of water to keep the soil moist. The soil is the surface soil in the area where the reference electrode will be used in the future.
[0024] The anodic polarization is carried out by means of constant current, and the ZF-4 potentiostat is used to anodize the zinc reference electrode in the soil. The consta...
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The invention discloses a method for preparing a long-acting solid zinc reference electrode used in soil, which comprises the following steps of: (1) selecting industrial pure zinc of required size, and sequentially polishing the pure zinc by using No.120 to No.600 water sanding paper; (2) rinsing the pure zinc by using tap water and distilled water, scrubbing the pure zinc by using acetone, connecting a lead, and coating a non-working face by adopting rosin paraffin liquid; (3) embedding the zinc electrode into the soil, and injecting a little amount of water to keep the soil moist; and (4) performing direct anodic oxidation on the zinc reference electrode in the soil to obtain a reaction product film covered zinc reference electrode. Compared with the untreated zinc reference electrode, the long-acting solid zinc reference electrode has good potential stability, solves the problem that the Cu / CuSO4 reference electrode in the prior art is easy to leak and lose effect, and is suitable for research and protection of soil corrosion.
Description
technical field [0001] The invention relates to a test device for soil corrosion research and protection, in particular to a preparation method for a long-term solid zinc reference electrode used in soil for a long time. Background technique [0002] At present, the corrosion test and protection of metal parts in soil mainly use saturated copper sulfate electrode as the reference electrode. However, saturated copper sulfate electrodes are prone to leakage. Shorter lifespan. [0003] Industrial pure zinc is used as a reference electrode in the seawater environment. Because the corrosion in seawater is controlled by oxygen diffusion, the seawater is well aerated, making the potential of zinc stable in seawater. [0004] Metal zinc electrodes in soil have a long service life and can be used in environments with low temperature and low moisture content. However, since the physical and chemical properties of the soil vary with the structural composition, water content and temp...
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IPC IPC(8): C23F13/08
Inventor 高志明王震田飞刘玲丽修妍刘永长
Owner TIANJIN UNIV