鉄鋼の高温, 高速海水による腐食の防止法について

(第1報) エポキシ樹脂塗料による鋼管の防食

抄録

We studied the preventive effects of paints upon the corrosion of steel pipes caused by high-temperature sea water running at high speed. The phenomenon is usually seen at iron works or electric power plants, etc. The results are as follows:
1) With painted steel panels dipped in NaCl solution ut 60°C, epoxy resin films have the most preventive power.
Especially, the film cured by isocyanate is better in adhesion to metals, hardness, heat resistance and chemical resistance than any other painted films.
2) Epoxy resin films applied with less than three coats of enamel have pin holes reaching the metal surface. These pin holes greatly promote the degradation of the film.
3) The degrading processes of epoxy resin films are represented by means of electric equivalent circuits. It is found that epoxy resin films hardly suffer from deformation.
4) The internal surfaces of 2″ steel pipes were covered with two coats of primer (containing polyamides as curing agent) and two coats of of enamel (containing isocyanates as curing agent).
After one year of practical use, there was no change on the specimens.