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Hydrophobing or organophiling treating of an aluminum plate was performed by using TTS (isopropyl triisostearoyl titanate) after pretreatment with nitric acid. The degree of the modification was determined from contact angle of water, surface free energy, and surface polarity. The modification was affected by nitric acid pretreating conditions to a greater extent with increasing treating temperature, nitric acid concentration, and dipping time. The modification was also affected by water rinsing time after the pretreatment; thus the rinsing had to be finished within 9 minutes. The effect of TTS treating time is not so notable in the case of the pretreatment with nitric acid of high concentrations and temperatures. In the case of low concentrations and low temperatures, the TTS treatment effected modification for a period of less than 10 minutes but didn't for over 10 minutes. And in the case of the pretreatment with 20% nitric acid, surface modification was effected sufficiently even by TTS treatment of 1×10-3mol/l.
社団法人表面技術協会の論文