Abstract 1. A METHOD OF FORMING A CONTINUOUS, ROUGH, POROUS AND HYDROPHOLOC COATING OVER A GENERALLY CLEAN ALUMINUM SURFACE WHICH COMPRISES THE STEPS OF: COATING THE ALUMINUM SURFACE BY IMMERSING IT FOR A PERIOD OF FROM 5 TO 20 MINUTES IN A FIRST SOLUTION CONTAINING BOTH AN ALKALI METAL CARBONATE AND AN ALKALI METAL CHROMATE OR DICHROMATE; MAINTAIN SAID FIRST SOLUTION AT A TEMPERATURE IN THE RANGE OF 170= F. TO 210* F.; MAINTAINING THE CHROMIUM TO CARBONATE RATIO OF SAID FIRST SOLUTION IN A RANGE FROM 0.05 TO 0.5 DURING THE TREATMENT OF SAID SURFACE; COATING THE ALUMINUM SURFACE TREATED BY SAID FIRST SOLUTION BY IMMERSING IT FOR A PERIOD OF 2 TO 20 MINUTES IN A SECOND SOLUTION CONTAINING BOTH AN ALKALI METAL OXIDE AND SILICON DIOXIDE; MAINTAINING SAID SECOND SOLUTION AT A TEMPERATURE IN THE RANGE OF FROM 160* F. TO 210* F.; AND MAINTAINING AN ALKALI METAL OXIDE TO SILICON DIOXIDE RATIO IN SAID SECOND SOLUTION IN A RANGE FROM 1:1.5 TO 2:1 DURING TREATMENT OF SAID SURFACE.
Inventors
👤 J Huff
👤 F Ludwig
👤 A Smith
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-03 19:52
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
A METHOD OF FORMING A CONTINUOUS, ROUGH, POROUS AND HYDROPHOLOC COATING OVER A GENERALLY CLEAN ALUMINUM SURFACE WHICH COMPRISES THE STEPS OF: COATING THE ALUMINUM SURFACE BY IMMERSING IT FOR A PERIOD OF FROM 5 TO 20 MINUTES IN A FIRST SOLUTION CONTAINING BOTH AN ALKALI METAL CARBONATE AND AN ALKALI METAL CHROMATE OR DICHROMATE; MAINTAIN SAID FIRST SOLUTION AT A TEMPERATURE IN THE RANGE OF 170= F. TO 210* F.; MAINTAINING THE CHROMIUM TO CARBONATE RATIO OF SAID FIRST SOLUTION IN A RANGE FROM 0.05 TO 0.5 DURING THE TREATMENT OF SAID SURFACE; COATING THE ALUMINUM SURFACE TREATED BY SAID FIRST SOLUTION BY IMMERSING IT FOR A PERIOD OF 2 TO 20 MINUTES IN A SECOND SOLUTION CONTAINING BOTH AN ALKALI METAL OXIDE AND SILICON DIOXIDE; MAINTAINING SAID SECOND SOLUTION AT A TEMPERATURE IN THE RANGE OF FROM 160* F. TO 210* F.; AND MAINTAINING AN ALKALI METAL OXIDE TO SILICON DIOXIDE RATIO IN SAID SECOND SOLUTION IN A RANGE FROM 1:1.5 TO 2:1 DURING TREATMENT OF SAID SURFACE.
Claim 2
Independent Claim
170 words
A METHOD OF FORMING A CONTINUOUS, ROUGH, POROUS AND HYDROPHOLOC COATING OVER A GENERALLY CLEAN ALUMINUM SURFACE WHICH COMPRISES THE STEPS OF: COATING THE ALUMINUM SURFACE BY IMMERSING IT FOR A PERIOD OF FROM 5 TO 20 MINUTES IN A FIRST SOLUTION CONTAINING BOTH AN ALKALI METAL CARBONATE AND AN ALKALI METAL CHROMATE OR DICHROMATE; MAINTAIN SAID FIRST SOLUTION AT A TEMPERATURE IN THE RANGE OF 170= F. TO 210* F.; MAINTAINING THE CHROMIUM TO CARBONATE RATIO OF SAID FIRST SOLUTION IN A RANGE FROM 0.05 TO 0.5 DURING THE TREATMENT OF SAID SURFACE; COATING THE ALUMINUM SURFACE TREATED BY SAID FIRST SOLUTION BY IMMERSING IT FOR A PERIOD OF 2 TO 20 MINUTES IN A SECOND SOLUTION CONTAINING BOTH AN ALKALI METAL OXIDE AND SILICON DIOXIDE; MAINTAINING SAID SECOND SOLUTION AT A TEMPERATURE IN THE RANGE OF FROM 160* F. TO 210* F.; AND MAINTAINING AN ALKALI METAL OXIDE TO SILICON DIOXIDE RATIO IN SAID SECOND SOLUTION IN A RANGE FROM 1:1.5 TO 2:1 DURING TREATMENT OF SAID SURFACE.