Ultrahigh-temperature water vapor oxidation corrosion device and method for evaluating zirconium alloy coating layer

Abstract

The invention discloses an ultrahigh-temperature water vapor oxidation corrosion device and method for evaluating a zirconium alloy coating layer. The device comprises a frame body, a well type heating furnace, a steam oxidation reaction chamber and a water supply mechanism; the frame body is of a hollow structure, the water supply mechanism comprises a water supply tank and a water storage tank,a gas inlet connector is arranged at the top of the water storage tank, the gas inlet connector is connected with an argon source through a vent pipe, a gas valve, a gas-pressure meter and a flow meter are arranged on the vent pipe, a steam oxidation reaction chamber comprises a casing pipe and a flange, an end cover is arranged at a part, extending out of a pit-type heating furnace, of the top ofthe casing pipe, and a hook is arranged at the bottom of the end cover. The method comprises the following steps: 1, preparing before testing; 2, mounting a zirconium alloy coating layer sample and azirconium alloy matrix sample; 3, testing the zirconium alloy coating layer sample and the zirconium alloy matrix sample; and 4, obtaining the oxidation corrosion performance of the zirconium alloy coating layer. The method is reasonable in design, the reliability of oxidation corrosion test data is improved, and a reference basis is provided for selection of the coating layer on the surface of azirconium alloy matrix.

Description

technical field [0001] The invention belongs to the technical field of high-temperature water vapor oxidation corrosion devices, and in particular relates to an ultra-high temperature water vapor oxidation corrosion device and method for evaluating zirconium alloy coatings. Background technique [0002] Zirconium alloy has a series of advantages such as good processing performance, high corrosion resistance, good mechanical strength, and low thermal neutron absorption rate, so it is the material of choice for nuclear reactor nuclear fuel sealing shells. However, zirconium alloy is very easy to react with water under the condition of >1000°C dehydration accident, releasing a large amount of hydrogen and heat, thus causing serious accidents. Coating high-temperature water vapor corrosion-resistant coatings on the surface of existing zirconium alloy material systems can effectively improve the accident tolerance of fuel cladding materials. Therefore, it is necessary to study...

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Problems solved by technology

[0003] Therefore, in order to more realistically simulate the loss of water accident conditions of nuclear reactors, ultra-high temperature water vapor oxidation and corrosion devices have become a need. The current water vapor oxidation and corrosion devices still have the following deficiencies: First, the water vapor oxidation and corrosion devices cannot Ensuring the purity of water vapor in the oxidation chamber affects the reliability of test data; second, the structure of the water vapor oxidation corrosion device is too complicated, resulting in high cost, difficult assembly, and difficult operation

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