TH97104B - How to prevent yellowing of steel plate surfaces after etching? - Google Patents

Abstract

DC60(11/04/13) Method to prevent yellowing of steel plate surface after removal of oxide layer containing Si. of the surface layer of the steel plate by etching the steel plate after continuous annealing, repeated etching, washing with water and making dry, which preserves the steel plate surface between etching and repeat etching and during etching and Such water rinsing is preferably wet condition to produce cold rolled steel sheets which prevent turning yellow. of the surface of the steel plate after etching by washing it with the cleaning water that has reduced The iron ion concentration does not exceed 20g/L. It has good external quality and has both the ability First coat of primer with corrosion resistance after coating. There is no picture to choose from.

Claims (1)

1. Fuel filter equipment, which is specifically remembered where It is a filter device with a filter body that acts as a mosquito character. And was installed to make the area The internal space of this filter is connected to the fuel suction port located inside the fuel tank, the fuel filter itself. It is assembled by stacking at least 2 filter materials together with at least 1 of them. It is a filter material made of non-woven fabric which Set the average opening diameter to be