Effect of Salicylic Acid on the Corrosion Resistance of Tin Plate

Abstract

Tin plate is a kind of low-price and widely used double-side-tinned sheet steel， and only an addition of a fluxing process is needed to achieve a good reflow effect when using methanesulfonate system to produce tin plate. Herein， in order to reduce the consumption of tin resource and improve the quality of tin plate， salicylic acid (SA) solution was used as the fluxing agent before the reflowing of tin plate. The effects of salicylic acid solution concentration on the corrosion resistance of tin plate and the variation of salicylic acid adsorption state on the surface of tin plate were studied and simulated by scanning electron microscope， Tafel curve， X-ray diffraction (XRD) and high resolution confocal microscopic laser Raman instrument. Results showed that the left shift of the C ＝O bond in salicylic acid made the orientation of tin grains shift to the lower plane (200). When the concentration of salicylic acid solution was 8 mL/L，the morphology and grain orientation of the tin-iron alloy layer on the tin plate were the optimal， and the corrosion resistance of tin plates with low tin contents was the best when fluxed at this concentration.

Keywords

• salicylic acid|tin plate|reflowing|tin-iron alloy layer