The creation of cast barriered shell for bimetalle and combined hydrogen-storage balloons

Analysis shows modern design balloons from austenitic steels, which they characterizes lack resistance to corrosion in a hydrogen environment. This leads to a «hydrogen degradation» of the vessel wall and loss of hydrogen in environment deference. There exists an technology of manufacturing the protective barrier membranes by coating the inner wall of the silver gold and copper, stainless steel, can prevent the penetration of hydrogen through the walls of the cylinders and to ensure reliability during their operation. However, these containers are characterized by high complexity and the cost and complexity of their manufacture.

The way to eliminate the «hydrogen degradation» of austenitic steel designed for applying protective barrier coating on the inner wall of the storage capacity of hydrogen. It consists of two successive technological operations. The first -the creation of a continuous diffusion layer thickness of 600-700 microns using aluminizing surface of steel. The second – the application layer on the diffusion barrier of shell-type alloy AK9 2-3 mm thick.

Create barrier membranes cast for cylinders combined with internal protective barrier wall made of corrosion-resistant aluminum alloy and the cxternal pover-from high-strength aluminum alloy, or polymeric material is achieved by getting them into the molds with consistent directional solidification of the molten metal and using the back extrusion-type parts «glass» of the castings. The walls of the aluminum cylinder are obtained by cross-sectional bifunctional in molds with directional solidification of the molten metal storage of hydrogen. Wall interior is made of corrosion-resistant alloy type AK9. External power – from high-strength alloy type AK8M3.

Manufacturing is carried out in two stages of barrier membranes, using the back extrusion parts such as «glass» of the castings. Shell protective barrier (the details of the «glass») is the two halves of the storage tanks of hydrogen are joined firmly together argon-welding.

Implementation will allow the creation of barrier membranes cast in the production of complex technologies are successfully used alloys of AK9 and AK8M3 as a structural materials in the manufacture of storage tanks of hydrogen fundamentally new design, to reduce metal consumption, eliminate completely the penetration of hydrogen through the wall of the cylinder, increasing the life of 1,5-2,0 times and recommend them for safe storage of hydrogen at a pressure of 2-10 MPa range.

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