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BONDERITEeTechnical Process Bulletin <br /> BONDERITE M-CR 1200S AERO <br /> CHROMATE COATING <br /> (KNOWN AS ALODINE 1200S) <br /> If the BONDERITE coating is too light,the cause may be one or more of the following: <br /> 1. The treating time is too short <br /> 2. The concentration of BONDERITE M-CR 12005 AERO (known as ALODINE 12005) in the bath is too low. <br /> 3. The temperature of the bath is outside the specified range. <br /> 4. The pH of the bath is outside the specified range. <br /> TESTING AND CONTROL: <br /> Never pipet by mouth, use a pipet filler. <br /> Concentration: <br /> Pipet a 5 ml sample into an iodimetric flask and dilute to approximately 100 ml with water. Add 1/2 teaspoon <br /> (approximately 1 g) of Reagent 2 and agitate to dissolve. Add about 10 ml of Reagent Solution 49 in 5 ml increments to <br /> the lip of the flask, raising the stopper slightly after each addition to allow the acid to run into the flask. Rinse the lip <br /> several times with water and replace the stopper. <br /> After the sample has settled for approximately one minute,titrate with Titrating solution 104 until a straw color is <br /> obtained. Do Not rezero the burette. Add several ml of Indicator 10 and continue the titration until the blue-black color <br /> disappears. The ml of Titrating Solution 104 used is the bath concentration value in points (ml). <br /> Concentration range: Within ± 1 point (ml) of the value which gives the desired results. <br /> To increase the value 1 point (ml): Add 1 Ib of BONDERITE M-CR 1200S AERO (known as ALODINE 1200S) per 100 gallons. <br /> Concentration: <br /> 1 ml of titrant= 1.73 mg/ml of hexavalent chrome in BONDERITE M-CR 1200S AERO (known as ALODINE 1200S) <br /> 1 ml of titrant=0.231 oz/gal of hexavalent chrome in BONDERITE M-CR 1200S AERO (known as ALODINE 12005) <br /> pH Determination: <br /> A pH determination should be made after each replenishing addition.The optimum pH for this bath is between 1.3 to <br /> 1.8. <br /> NOTE: The pH of the BONDERITE M-CR 12005 AERO(known as ALODINE 12005) bath is controlled by the addition of <br /> 1/2 pint of concentrated nitric acid for every 2 to 4 pounds of BONDERITE M-CR 12005 AERO(known as ALODINE <br /> 1200S) used. It is recommended that no large bulk additions to nitric acid be made.The nitric acid additions should <br /> be made along with the required BONDERITE M-CR 1200S AERO (known as ALODINE 1200S) additions. <br /> 0 Henkel <br /> 5of8 <br />