Removal of Surface Reaction Layer of Plate Heat Exchanger

Removal of Surface Reaction Layer of Plate Heat Exchanger

The surface reaction layer is the main factor affecting the physical and chemical properties of the titanium casting. Before the titanium casting grinding and polishing, it is necessary to completely remove the surface pollution layer in order to achieve satisfactory polishing effect. The surface reaction layer of titanium can be completely removed by pickling after blasting.

Removal of Surface Reaction Layer of Plate Heat Exchanger
1. Sandblasting: titanium casting sandblasting the general use of white corundum coarse spray is better, sandblasting pressure than non-precious metals are smaller, generally controlled below 0.45Mpa. Because the jet pressure is too large, the impact of titanium on the titanium surface of the spark, the temperature can react with the titanium surface, the formation of secondary pollution, affecting the surface quality. Time for 15 to 30 seconds, only to remove the surface of the sticky sand, the surface sintered layer and part of the oxide layer can be. The rest of the surface reaction layer structure should be quickly removed by chemical pickling method.
2. Pickling: Pickling can quickly remove the surface reaction layer, and the surface will not produce other elements of pollution. HF-HCl series and HF-HNO3 acid pickling solution can be used for pickling of titanium, but HF-HCl-based acid solution hydrogen absorption capacity is large, and HF-HNO3 acid pickling liquid hydrogen absorption is small, can control HNO3 Of the concentration of hydrogen absorption, and the surface of the bright treatment, the general concentration of HF in the 3% to 5%, HNO3 concentration of 15% to 30% is appropriate.




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