Document DvovbZyN8jrV11O5N5Embqnwn

E. I. DU PONT DE NEMOURS & COMPANY KREBS PIGMENTS DEPARTMENT 256 VANDERPOOL STREET NEWARK, NEW JERSEY Serial No. Copy No. RS~44~&3 7 v ' ! Period Covered : NEWARK PLANT PIGMENT COLOR RESEARCH REPORT Final Kaporfc a&ni&ture Paael Exposure Series #63 A*F*P Analogues oa Magaesiuss Complete Exposm* & FILE: DATE: 143.54 10/13/44 i Lj I CO NJ803S N37938 DU P050149731 Bmua m* Ispy So* / _ um m ; ;. WtMUBt* W&S$ p ig mie s tmm mmmm morn's Flsal Report fitlei Kiaiature Panel Exposure Series #68 A.F*f, toelofaes o h Magnesium Period Covered! Complete Exposure APPKSVEB Bis OriW78*31 SBSMXOTBi g/25/44 ?, E. Bolton Am ZS0CS 10/18/44 DUP050149732 -2- The preparation and the evaluation of complex ammonium phosphates on steel has been reported in KH-43-163. The present series sought to evaluate applicable compounds on light metals* The following materials were studied* Ammo*ilsa magnesium phosphate* D-5115 Ammonium calcium phosphate, 1Q39-4B Ammonium calcium meta-phosphate, 1039-4C Ammonium aluminum phosphate, 956-6D Ammonium sine phosphate, D-5132 - Ammonium ferrous phosphate, SW-4123 The exposure was on magnesium panels in a modified Havy 52-P-18 primer, with and without sine yellow* C0SGMIQI08* The salt water immersion panels shewed' soma promise for ammonium magnesium phosphate and ammonium ferrous phosphate in combination with sine yellow as primer pigments in a light metal primer* The inclusion of these phosphate pigments in a sine yellow ?rimer improved its performance} each had about equal effect. When he phosphate compounds were the sole Inhibiting pigments the per formance was definitely inferior to the sine yellow control* Eo conclusions were drawn from the miniature panel moisture condensation exposures; the films had been nearly complete ly eroded but no corrosion was In evidence* The results of immersion of miniature panels in 3% Turk Island salt solution have been tabulated at the end of this report* So moisture condensation data are available; after eight month exposure (0*2 mil film) the paints were badly eroded but no corrosion was evident. In the ease of the ammonium sine phosphate exposure (D-5132) the surface was covered with clear, colorless crystals, as yet unidentified* The primers described in the tabulation were prepared by half pint ball mill. 1" x 3" Dow metal panels (J-l alloy) were given the Dow #7 surface treatment (acidic sodium bichromate bath)* Duplicate panels were painted using the "Dry Brush Technique* (+0*2 mil dry film)* The exposure was carried out in the roof moisture condensation box* sun and weather during the daylight hours with positive moisture condensation at night. Similar single panels were prepared for immersion in a 3% solution of Turk Island Sea Salt (D-4226). Before immersion the DUP050149733 - 3'lave* portion of the panels tree scratched (5/8* x 5/8s area) in a cross hatch pattern (1/16* between lines) to this bright metal* the paints containing ammonium calcium setaphosphate showed excessive reactivity that resulted in bad bodying; these paints were not exposed* For further details refer to notebook 1039 experiment 5* DU P050149734 DUP050149735