Inorganic coating

Claim 1

A COATING COMPOSITION FOR FERROUS METAL SURFACES CONSISTING ESSENTIALLY OF (A) A PRIMARY COATING MIXTURE OF A FINELY DIVIDED ZINC METAL DISPERSED IN AN AQUEOUS SOLUTON OF AN ALKALI METAL PHOSPHATE HAVING A PH OF BETWEEN 6.5 AND 11.5, THE ALKALI METAL PHOSPHATE BEING PREDOMINANTLY IN THE FORM OF ALKALI METAL MONOHYDROGEN PHOSPHATE, THERE BEING PRESENT AT LEAST 7 PARTS OF SAID ALKALI METAL MONOHYDROGEN PHOSPHATE EXPRESSED AS POTASSIUM MONOHYDROGEN PHOSPHATE AND NOT MORE THAN 25.0 PARTS PER 100 PARTS OF SAID FINELY DIVIDED ZINC METAL AND (B) A METAL OXIDE REGULATOR FOR LENGTHENING THE POT LIFE OF SAID PRIMARY COATING MIXTURE WHILE OBVIATING THE TENDENCY OF SAID PRIMARY COATING MIXTURE TO BLISTER, THEREBY IMPROVING THE COVERING CHARACTERISTICS AND FILM HARDNESS AND TOUGHNESS WHEN SAID PRIMARY COATING MIXTURE IS CURED AT ROOM TEMPERATURE, SAID METAL OXIDE REGULATOR SELECTED FROM THE GROUP CONSISTING OF LITHARGE, MIXTURES OF LITHARGE AND RED LEAD CONTAINING UP TO 50% OF RED LEAD, MIXTURES OF LITHARGE AND LEAD DIOXIDE CONTAINING UP TO 50% OF LEAD DIOXIDE, MIXTURES OF LITHRAGE AND UP TO 50% OF LEAD DIOXIDE AND RED LEAD, CUPROUS OXIDE, COLLOIDAL FERRIC OXIDE, COLLODIAL FERRIC HYDROXIDE, AND MIXTURES OF LITHARGE WITH UP TO 50% OF CUPROUS OXIDE, COLLOIDAL FERRIC OXIDE AND COLLOIDAL FERRIC HYDROXIDE, THESE EACH ALONE AND TOGETHER, SAID METAL OXIDE REGULATOR BEING PRESENT IN AN AMOUNT OF ABOUT 14-55% BY WEIGHT OF THE ZINC DUST WHICH IS PRESENT AND AN AMOUNT OF WATER IN SAID COATING COMPOSITION OF BETWEEN 12% AND 40%.