Method for removing iron ions on titanium surface before heat treatment of titanium clad steel plate device

Abstract

The invention discloses a method for removing iron ions on a titanium surface before the heat treatment of a titanium clad steel plate device. The method comprises the following steps of polishing and flattening the inner sides of the longitudinal circumferential welds on a titanium clad steel plate device body, removing the iron ash and dust after polishing, and cleaning the surface; removing the heat-resistant rubberized fabric at the two sides of all longitudinal circumferential welds, and grinding away the welding spots splashed on the titanium clad steel plate device body during welding of the longitudinal circumferential welds; pasting and blocking all longitudinal circumferential welds through a butyl water-leakage-proof adhesive tape; carrying out blind sealing on all pipe openings in the titanium clad steel plate device body from the titanium material side; removing the titanium protection paper on the inner surface of the titanium clad steel plate device body; carrying out acid pickling passivation treatment on the interior of the titanium clad steel plate device body; and carrying out iron ion pollution detection on the titanium surface of the titanium clad steel plate device body by adopting a blue point detection method. The method can quickly, economically and effectively remove the iron ion pollution on the surface of a titanium layer and clean the surface of the titanium layer, and prevents iron ions on the surface of the titanium layer from eroding and damaging the materials in heat treatment.

Description

technical field [0001] The invention relates to the technical field of titanium-clad steel plate equipment, in particular to a method for removing iron ions on the titanium surface before heat treatment of titanium-clad steel plate equipment. Background technique [0002] Titanium clad steel plate not only has the corrosion resistance of titanium, but also has the strength of ordinary steel plate as a structure. It has good cold working, warm working, hot working formability and weldability, and the most important thing is that the production cost is also greatly reduced. At present, it is widely used in the manufacture of pressure vessels for chemical equipment, seawater heat exchangers and chemical reaction vessels. [0003] For the manufacture of titanium clad steel plate equipment that requires heat treatment, the heat treatment temperature of titanium clad steel plate equipment is generally 540±20°C. When the heat treatment temperature is above 370°C, the iron ions rema...

AI Technical Summary

Problems solved by technology

[0004] If the titanium clad steel plate equipment is directly pickled and passivated to remove iron ions on the titanium surface, since the carbon steel weld bead is not isolated, the pure titanium insert and the cover plate are not assembled and welded, the entire carbon steel layer is exposed, and pickling and passivation will cause carbon The steel weld bead pickling water and iron pollute the surface of the titanium layer for the second time. Therefore, the existing method of removing iron ions on the titanium surface and cleaning the surface is to use manual grinding and polishing. This method consumes a lot of manpower and material resources (consumables ), time-consuming, and the dust after grinding and polishing is not easy to remove

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