Hiroyuki Tanabe

Anticorrosive Performance of Moisture Cured Polyurethane Paint after Low Temperature Curing

試験後の防食性も良好であることが判明した。 A moisture cured one-component polyurethane resin is cured by the reaction of its isocyanate group with moisture in the air or adsorbed water on the substrate. This curing system was contrived in Germany. And, it had good protective performance of this coating system for more than 20 years demonstrated through practical applications. From our studies on curing mechanism and protective performance, we found that the coating film dried at a temperature as low as 5°C and at a humidity as low as 50% RH showed excellent protective performance. Protective performance of the coating film after low temperature impact resistance test was also proved to be good because of its flexibility. 永井 昌憲 Masanori NAGAI 山本 基弘 Motohiro YAMAMOTO 3 技術報文-1 湿気硬化形ポリウレタン樹脂塗料の低温乾燥後の防食性評価

Anti-Corrosive Mechanism of Glass Flake Filled Coating (II): Preventive Effects for Penteration of Corrosive Substances@@@腐食性物質の透過抑制効果

近年,不 飽和ポ リエ ステル樹 脂,ビ ニルエステル樹 脂 等に,直 径100~150μm,厚 さ数 μm程 度のガ ラス フ レー クを混入 した塗料が市場に現われ,石 油 タンク底板 の防食 システム として,急 速 にそ の需要を伸ば しつつあ る。 従来 の,い わ ゆるフ レー クライニ ングとの相違点は, フ レー クライニ ソグは直径数mm程 度 の大 きなガラスフ レー クを使用 しているため,ロ ー ラー,ス プ レーなど, 通 常の塗料の塗装法が適用 で きず,コ テ塗 りに よらざる を得ないが,こ こでい うガラスフレーク入 りの塗料(フ レー ク澱一 ト)は,灘 一ラー,ス プレーな ど,従 来の塗 料 と同様 に塗装 できるとい う特長を有 してい る。 このた め,石 油 タ ンクな ど,大 型鋼構造物への施工が可能 とな り,そ のこ とに よ り,フ レー クコー トの用途が飛躍的に 拡大 した もの と思われ る。 フ レー クコー トの防食機構 と しては,鱗 片状の ガラス フレー クが素地面 に対 して平行 に配列す ることによ り,

Effect of Zinc Rich Paints on the Durability of Epoxy Top Coats in Sodium Chloride Solution

Effect of inorganic zinc rich paints on the durability of epoxy top coat was investigated in 3 wt % sodium chloride solution. It was found that paint failure of epoxy top coat such as blisters was predicted by polarization resistance measurement, impedance measurement, electrode potential measurement of the coated mild steel. The coated mild steel which had no failure for 400 days hold high polarization resistance over the same period. The coated steel also kept a initial value of high impedance. The same sample showed only a slight shift of electrode potential toward the less noble direction. Epoxy top coat over zinc rich paints had no failure after 400 day service and the system was superior to the epoxy top coat which was directly applied to the blasted steel. As a conclusion, the coating system that epoxy top coat was applied to zinc rich paint-coated steel showed the most excellent durability in 3 wt % sodium chloride solution, evaluating from electrochemical measurements and the result coincided with the observation of the test panels.