Rapid hydrogen measurement device and hydrogen measurement method for aluminium alloy

Abstract

The invention discloses rapid hydrogen measurement device and hydrogen measurement method for aluminium alloy, and belongs to the technical field of alloy melt purification and detection. The device comprises a vacuum pump, wherein a sealing ring is arranged between a cover board and a vacuum container; the vacuum pump is communicated with a vacuum chamber through a vacuum pipeline; and a vacuum relief valve, a vacuum degree adjusting valve and a vacuum meter are respectively arranged on the vacuum pipeline. The method comprises the following steps: turning on the vacuum pump, so that the set pressure is reached in the vacuum chamber; turning off the vacuum pump, decompressing the vacuum chamber into an atmospheric pressure state, and opening the cover board; casting to-be-measured melt into a crucible, so that the melt is solidified under an atmospheric pressure; pouring the to-be-measured melt into another crucible, putting into the vacuum chamber, covering the cover board, and turning on the vacuum pump, so that the to-be-measured melt is solidified under the set vacuum condition; and measuring the density of a reference sample solidified under the atmospheric pressure and the density of the sample solidified under the set vacuum condition by adopting a densimeter, determining the density index of the to-be-measured aluminium alloy melt, and determining the hydrogen content of the to-be-measured melt.

Description

technical field [0001] The invention belongs to the technical field of alloy melt purification and detection, and in particular relates to an aluminum alloy rapid hydrogen measuring device and a hydrogen measuring method, which are mainly used for detecting hydrogen content in aluminum alloy melts. Background technique [0002] Purification of aluminum alloy melt is the key technology to ensure its metallurgical quality, and reducing the hydrogen content in the melt is the main purpose of purification of aluminum alloy melt. During the smelting process, aluminum alloy is very sensitive to hydrogen or water vapor, and it will inevitably absorb a certain degree of hydrogen. If the melt is cast without treatment (die casting or continuous casting), defects such as porosity and porosity will occur, and may cause hot cracking of ingots or castings, thereby increasing the scrap rate. Therefore, on the one hand, the introduction of hydrogen should be minimized during the smelting ...

AI Technical Summary

Problems solved by technology

Inadequacies: the presence or absence of inclusions in the melt will affect the results; the steam of volatile elements (Mg, Zn) in the aluminum alloy is easy to interfere with the judgment; the equipment cost is high and the maintenance cost is high

LECO's RH-402 hydrogen measuring instrument belongs to the solid-state hydrogen measuring method. The main advantage of this method is high precision, but the existing problems are high equipment cost, high operating cost, and slow analysis speed, which is not suitable for online hydrogen measurement.

Images