# Dehydration-Driven Changes in Solid Polymer Electrolytes: Implications for Titanium Anodizing Efficiency

## TL;DR

This paper studies how temperature affects a solid electrolyte used in titanium anodizing, finding that controlled dehydration improves process efficiency and film quality.

## Contribution

The novel contribution is identifying dehydration-driven microstructural changes that enhance titanium anodizing efficiency without compromising film uniformity.

## Key findings

- Thermal aging above 40 °C causes microcracks and shape deformation in the electrolyte.
- Dehydration reduces particle size by up to 39.5%, shifting distribution from bimodal to trimodal.
- Aged electrolytes improve TiO2 film optical properties while maintaining thickness and uniformity.

## Abstract

This study investigates the thermal stability and microstructural evolution of the solid electrolyte medium used in DLyte® dry electropolishing and dry anodizing processes. Samples were thermally aged between 30 °C and 45 °C to simulate Joule heating during industrial operation. Visual and SEM analyses revealed shape deformation and microcrack formation at temperatures above 40 °C, potentially reducing particle packing efficiency and electrolyte performance. Particle size distribution shifted from bimodal to trimodal upon aging, with an overall size reduction of up to 39.5% due to dehydration effects, impacting ionic transport properties. Weight-loss measurements indicated a diffusion-limited dehydration mechanism, stabilizing at 15–16% mass loss. Fourier transform infrared analysis confirmed water removal while maintaining the essential sulfonic acid groups responsible for ionic conductivity. In dry anodizing tests on titanium, aged electrolytes enhanced process efficiency, producing TiO2 films with improved optical properties—color and brightness—while preserving thickness and uniformity (~70 nm). The results highlight the need to carefully control thermal exposure to maintain electrolyte integrity and ensure consistent process performance.