Anodizing process and system

Claim 1

AN ANODIZING METHOD FOR FORMING A RELATIVELY THICK AND HARD INORGANIC CORROSION RESISTANT NON-REACTIVE ANODIC FILM ON AN ELECTRICALLY CONDUCTIVE BODY CAPABLE OF BEING ANODIZED WHICH INCLUDES: PROVIDING AN ELECTROLYTE HAVING A TENDENCY TO DISSOLVE THE ANODIC OXIDE FILM ON THE ELECTRICALLY CONDUCTIVE BODY, THE RATE OF WHICH DISSOLUTION INCREASES WITH INCREASE IN THE TEMPERATURE OF THE ELECTROLYTE AT THE SURFACE OF THE BODY, IMMERSING AT LEAST A PORTION OF THE ELECTRICALLY CONDUCTIVE BODY IN THE ELECTROLYTE, AND PASSING A SERIES OF UNI-DIRECTIONAL ELECTRICAL CURRENT PULSES OF A REPETITION FREQUENCY OF ABOUT 60 PULSES PER SECOND THROUGH THE ELECTROLYTE AND THROUGH THE ELECTRICALLY CONDUCTIVE BODY TO PROVIDE AN ANODIC OXIDE FILM ON THE ELECTRICALLY CONDUCTIVE BODY, WITH EACH SURCESSIVE PULSE PENETRATING THE OXIDE FILM TO THE ELECTRICALLY CONDUCTIVE BODY AND WITH EACH OF SAID UNIDIRECTIONAL CURRENT PULSES BEING SEPARATED BY AN INTERVAL OF ESSENTAILLY ZERO CURRENT FLOW THROUGH THE ELECTROLYTE AND THROUGH THE ELECTRICALLY CONDUCTIVE BODY, WITH THE INTERVAL BETWEEN EACH OF SUCH CURRENT PULSES BEING OF A DURATION APPROXIMATELY THREE TIMES THE DURATION OF THE INTERVAL OF EACH OF THE CURRENT PULSES TO PROVIDE A COOLING PERIOD AT THE SURFACE OF THE IMMERSED PORTION OF THE ELECTRICALLY CONDUCTIVE BODY BETWEEN EACH OF SAID CURRENT PULSES, THE COOLING PERIOD BETWEEN EACH CURRENT PULSES BEING APPROXIMATELY THREE TIMES THE DURATION OF EACH CURRENT PULSE.