Influence of Na2SO4 Electrolyzed Oxidizing Water on the Surface of Oxygen-free Copper

This paper describes the elucidation about the influence of NaCl electrolyzed oxidizing water (It abbreviates as EO water) on the surface of kovar alloy (Fe-29.72wt%Ni-16.28wt%Co). First, the etching characteristic of NaCl EO water against the surface of kovar alloy was clarified using chemicals for comparative immersion experiments. The comparative study showed that as for the etching efficiency on the surface of kovar alloy, NaCl EO water was superior, and the selective etching tendency is weak to HCl solution. Next, by the observation using SEM image, the influence of NaCl EO water on the surface shape of kovar alloy was clarified. The results indicated that when using NaCl EO water, the test pieces surface of only polishing becomes smooth but in the test pieces surface of heating processing, the small pit occurs. Lastly, as for the test pieces after heating processing, it did the surface oxidation layer removal experiment by the immersion. The results show that NaCl EO water can remove the surface oxidation layer like HCl solution approximately. However, the surface oxidation layer which is thin newly is formed in the surface which was processed with NaCl EO water. By this study, we got the suggestion that NaCl EO water can be applied to the surface treatment such as the etching of kovar alloy.

Influence of NaCl electrolyzed oxidizing water on the surface of kovar alloy

Sato¹

2015

Surface modification processing of kovar alloy using Na2SO4 electrolyzed oxidizing water

Sato¹,

Kawakubo²

2017

This paper discusses the surface modification processing of kovar alloy ) by Na 2 SO 4 electrolyzed oxidizing water (hereinafter referred to as EO water). First, the etching effect of Na 2 SO 4 EO water on the surface of kovar alloy was clarified by comparative experiments of chemicals and NaCl EO water. The comparative study showed that as for the etching effect on the surface of kovar alloy, Na 2 SO 4 EO water was superior to H 2 SO 4 solution, but inferior to NaCl EO water. Next, by the observation using SEM image, the influence of Na 2 SO 4 EO water on the surface shape of kovar alloy was clarified. The results indicated that when using Na 2 SO 4 EO water, the surface of polished test pieces which had not been heat-treated becomes smooth, but in the test pieces surface which had been heat-treated, a lot of dimples had occurred. When using the supersonic together with one of Na 2 SO 4 EO water or NaCl EO water, the surface shape became smooth. Lastly, as for the test pieces after heat treatment, the surface oxidation layer removal experiment by the immersion was carried out. The results showed that Na 2 SO 4 EO water could remove the surface oxidation layer like H 2 SO 4 solution approximately. However, thin surface oxidation layer might be formed when using Na 2 SO 4 EO water. By this study, we received the suggestion that Na 2 SO 4 EO water could be applied to the surface treatment such as the etching of kovar alloy.

Surface modification processing of Co-elinvar for hair spring using Na2SO4 electrolyzed oxidizing water

Sato

Takeuchi

Tsuchiya

2018

This paper discusses the surface modification processing of Co-elinvar alloy Ni-0.50mass%Mn-0.30mass%Si) using Na 2 SO 4 electrolyzed oxidizing water (hereinafter to as EO water). Co-elinvar alloy is widely used as the material of watch main hair spring. To improve the disentangled characteristics of hair spring after shape processing, it is necessary to roughen the surface. First, the roughening effect of Na 2 SO 4 EO water on the surface of Co-elinvar alloy was elucidated by immersion test. The result of immersion test showed that when using supersonic together, compared with the case of only immersion, the scar of etching in test pieces surface becomes more homogeneous, but the section size and the Young's modulus of sample pieces decrease. Also, if processing time with supersonic use is optimization, the surface roughness becomes smooth and stronger. Next, the relation between roughening effect of Na 2 SO 4 EO water and when it was produced was clarified. The results showed that if it was produced within 180 minutes, etching rate of Na 2 SO 4 EO water was not influenced by elapsed time and becomes constant approximately, and the micro-shape of the surface isn't influenced by the elapsed time, it was smooth. By this study, we received the suggestion that Na 2 SO 4 EO water could be applied to surface processing such as the roughening process of Co-elinvar alloy.