Reference

Pretreating cold-rolled steel sheets for painting

Pretreating cold-rolled steel sheets for painting. (Nisshin Steel Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 59016981 A2 28 Jan 1984 Showa, 7 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C23F007-10; C23F007-26. APPLICATION: JP 82-122994 16 Jul 1982. DOCUMENT TYPE: Patent CA Section: 55 (Ferrous Metals and Alloys) Section cross-reference(s): 42 The method includes (1) phosphating, (2) washing with cold or hot water; (3) coating with a chromate-type prepainting treatment soln. (of coating type, 0.2-2 m thick, at 50-70°); and (4) drying at 70-120° without rinsing to form a chromate conversion coating (Cr 10-100 mg/m2). The treatment improves adhesion, scratch and corrosion resistance of the paint on cold-rolled steel sheets, and can be easily applied at a low cost without environmental pollution. Thus, a cold-rolled steel sheet (0.8 mm thick) was degreased, phosphated with a Zn phosphate-type agent Granodine 46N-1 [13847-22-8], rinsed with hot water, treated with a chromate treatment soln. Accomet C [90599-55-6], and dried to form a chromate conversion coating (0.2 m thick, Cr 10 mg/m2). The sheet was coated (5 m thick) with an epoxy type primer Superlac DIF [80702-63-2], baked, coated (baked thickness 15 m) with a polyester paint (Superlac DIF), and baked to show excellent adhesion, scratch and corrosion resistance of the paint.

Comparison of the effects of resin composition and pigments on the anti-corrosive properties of powder coatings

Comparison of the effects of resin composition and pigments on the anti-corrosive properties of powder coatings. Van de Werff, A. (Scado B. V., Zwolle, Neth.). J. Oil Colour Chem. Assoc., 59(12), 433-8 (English) 1976. CODEN: JOCCAB. DOCUMENT TYPE: Journal CA Section: 42 (Coatings, Inks, and Related Products) Anticorrosive pigments give little resistance to corrosion in powder coatings at low concns., but at high concns., zinc phosphate [13847-22-8] offers some improvement. Extenders, in general, improve salt spray resistance and resistance to rusting. 16453-74-0 and 9004-36-8 are just another two chemicals used in this study. Polyamide resin H 105 [39385-68-7] improved all except polyurethane coatings, and silicone resins improved only one polyester system. .