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Oxide anode material and preparation process for cathodic protection and restoration of offshore platforms

A cathodic protection and anode material technology, which is applied in metal material coating process, liquid chemical plating, coating, etc., can solve the problem of insufficient stability of oxide anode and short service life, etc. problem, to achieve the effect of anti-polarization performance and stability improvement, improved service life and long service life

Active Publication Date: 2019-07-12
SUNRUI MARINE ENVIRONMENT ENG
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Problems solved by technology

[0004] Ti / IrO 2 -Ta 2 o 5 Oxide anode is considered as a highly stable metal oxide anode material, which has a long service life under oxygen evolution conditions, but Ti / IrO 2 -Ta 2 o 5 The stability of oxide anodes is still insufficient under some harsh working conditions
This kind of metal oxide anode usually does not allow the rated working current density to exceed 600A / m 2 , while the actual requirement reaches 2000A / m 2 , short service life (it is expected to be used for 15-20 years under low current density, but under high current density working conditions, the service life is significantly shortened to less than 10 years), which cannot meet the needs of offshore platform cathodic protection repair

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  • Oxide anode material and preparation process for cathodic protection and restoration of offshore platforms

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Embodiment

[0033] (1) Pretreatment of the substrate

[0034] Industrial pure titanium is selected as the base material of the oxide anode. The shape of the base material is plate-shaped and the size is 200×100mm. Sandblasting is performed on the base to increase the surface roughness; The alkali washing solution is kept warm for 1 hour to remove surface oil. Alkaline washing solution is 8% NaOH, Na 3 PO 4 and Na 2 CO 3 Mixture, where NaOH: Na 3 PO 4 : Na 2 CO 3 =4:45:65 (mass ratio); place the degreased titanium substrate in a boiling oxalic acid solution with a mass percentage of 20-25% for etching for 1-4 hours, wash it with deionized water after etching, and place it in ethanol stored in solution.

[0035] (2) Ir-Nb-Rh coating solution configuration

[0036] Dissolve a certain amount of chloroiridic acid, niobium pentachloride, and rhodium chloride in n-butanol. The atomic percentages of Ir, Nb, and Rh are shown in Table 1. Add 10ml of hydrochloric acid to every 100ml of coa...

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Abstract

Disclosed is an oxide anode material and preparation process used for cathodic protection and restoration of an ocean platform. The oxide anode material is characterized in that an active coating layer is coated on a titanium substrate. The active coating layer is composed of IrO2, Nb2O5, and RhO2. The coating liquid ratio of the active coating layer is based on the atomic percentage, wherein content of Ir, Nb, and Rh are 30-60% of Ir, 15-35% of Nb, and 25-50% of Rh. The total concentration of metal ions of a coating liquid is 0.1-0.5 mol / L. The loading coating amount is no less than 12g / m2. The preparation process procedures comprises sand blasting, oil removing, mechanical erosion, configuration of the active coating layer coating liquid, and brushing and sintering of the active coatinglayer. Compared with an existing technology, the oxide anode material is simple in preparation technology, and the prepared electrode is high in density and good in stability in a working current, andlong in service life; a metal oxide electrode with a larger size or a complex structure can be prepared and includes clintheriform, reticulation, tublar, and arcuation and the like.

Description

technical field [0001] The invention relates to an oxide anode material for cathodic protection applied current of marine engineering equipment and a preparation process thereof, belonging to the technical field of electrochemical protection and the field of electrochemistry. Background technique [0002] At present, the cathodic protection systems of various types of offshore platforms built in my country have approached or exceeded their design life. If the offshore platforms are to be used for a later period, in order to ensure the safety and reliability of the platforms, the cathodic protection systems must be repaired. Current cathodic protection repair technologies for offshore platforms include sacrificial anode method and impressed current method. Repairing in-service platforms by sacrificial anodes requires divers to weld a large number of anodes to steel structures such as jackets by means of underwater welding according to the traditional installation method. Howe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/12C23F13/12
CPCC23C18/1216C23F13/12
Inventor 王海涛王辉许实赵超王洪仁王廷勇
Owner SUNRUI MARINE ENVIRONMENT ENG
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