| Summary: | 碩士 === 國立交通大學 === 工學院精密與自動化工程學程 === 99 === The fuel cell new energy has been considered as an important substitute to replace fossil fuels for decades. In order to make the application of hydrogen energy popular, portable storage devices for hydrogen, such as hydrogen storage bottle, have become a critical element.
This study investigated the resistance effect of sodium silicate solution which was coated on the surface of welding zone to the Stress Corrosion Cracking (SCC). SCC was caused by storage hydrogen penetration to the micro-crack that occasionally occurred while welding the joint by the tungsten insert gas arc welding (GTWA) between bottle cover and bottle body both made of the material of aluminum alloy 7075 (Al-Zn-Mg). Four study factors, including curing agents, curing methods, coating thicknesses and baking temperatures, to the coating effect of sodium silicate were investigated. By obtaining the optimal parameters from the tested factors by Taguchi analysis method, the corrosion resistance of welding zone can be effectively improved.
The obtained optimum coating parameter by Taguchi analysis method showed that corrosion resistance of tested group adding with magnesium oxide as curing agent was increased to 200% compared to the sodium solution without adding curing agent. The results also demonstrated that the penetration depth of tested group adding with talc as an curing agent was increased to 20%.
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