(3)
Scrub part surface with stiff fiber bristled brush to remove surface contamination.
NOTE: If old gaskets or sealing compounds are present, carefully lift softened gaskets with knife blade and scrape surface clean.
Cleaning
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WARNING: USE CORRECT PERSONAL PROTECTION. COMPRESSED AIR WILL CAUSE LOOSE PARTICLES THAT CAN GET IN YOUR EYES. COMPRESSED AIRFLOW CAN CAUSE CUTS, DO NOT POINT IT AT YOUR SKIN.
(4)
Rinse parts in water at 80 to 110F (27 to 43C).
WARNING: USE CORRECT PERSONAL PROTECTION. COMPRESSED AIR WILL CAUSE LOOSE PARTICLES THAT CAN GET IN YOUR EYES. COMPRESSED AIRFLOW CAN CAUSE CUTS, DO NOT POINT IT AT YOUR SKIN.
(5)
Pressure air-dry (20 psig (137,895 kPa) maximum) to dry parts.
WARNING: USE CORRECT PERSONAL PROTECTION. CHROMIC-NITRIC PICKLE SOLUTIONS ARE HAZARDOUS. AVOID INHALING FUMES, DUST, OR MIST. AVOID CONTACT WITH SKIN. AFTER PREPARATION, WASH HANDS AND FACE THOROUGHLY.
(6)
Treat corroded areas with chromic-nitric pickle solution (Method No. 202C) until corrosion is removed. Repeat Steps (4) and (5) to rinse and dry parts.
NOTE: If parts are hard anodized and chromic-nitric pickle solution (Method No. 202C) is used to remove heavy corrosion, softening of the finish will result. Completely strip parts and apply new anodize finish in accordance with Repair (SECTION IV).
WARNING: USE CORRECT PERSONAL PROTECTION. CHROMATE CONVERSION COATING SOLUTIONS ARE HAZARDOUS. AVOID INHALING FUMES, DUST, OR MIST. AVOID CONTACT WITH SKIN. AFTER PREPARATION, WASH HANDS AND FACE THOROUGHLY.
(7)
Coat bare area with chromate conversion coating solution (Method No. 202B). Allow area to remain wet for one minute.
(8)
Rinse parts with water 80 to 110F (27 to 43C).
WARNING: USE CORRECT PERSONAL PROTECTION. COMPRESSED AIR WILL CAUSE LOOSE PARTICLES THAT CAN GET IN YOUR EYES. COMPRESSED AIRFLOW CAN CAUSE CUTS, DO NOT POINT IT AT YOUR SKIN.
(9)
Pressure air-dry (20 psig (137,895 kPa) maximum) to remove excess water from part.
(10)
Dry part in oven at a temperature not to exceed 160F (71C).
(11)
Store parts in dry place away from corrosive fumes.
Cleaning
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G. Method No. 203G: Cleaning Non-corroded Magnesium Clean non-corroded magnesium parts as follows: WARNING: SOLVENT VAPORS ARE TOXIC AND FLAMMABLE. DO NOT INHALE VAPORS. OBSERVE FIRE PRECAUTIONS.
(1)
Clean surfaces with solvent (Federal Specification P-D-680, Type I) (SECTION VII) to remove oil and grease contamination.
WARNING: USE CORRECT PERSONAL PROTECTION. ALKALINE CLEANING SOLUTIONS ARE HAZARDOUS. AVOID INHALING FUMES OR MIST. AVOID CONTACT WITH SKIN. AFTER USE, WASH HANDS AND FACE THOROUGHLY.
(2)
Immerse parts in alkaline cleaner solution (Method No. 202A).
NOTE: Allow parts to soak for five to ten minutes if flange surfaces have gaskets or sealing compounds stuck to them.
(3)
Brush part surfaces with soft plastic fiber bristled brush to remove surface contamination.
NOTE: If old gaskets or sealing compounds are present, carefully lift softened gaskets with knife blade and scrape surface clean.
(4)
Rinse parts in warm tap water at 80 to 110F (27 to 43C).
CAUTION: WHEN PREPARING MAGNESIUM TOUCH-UP SOLUTION USE EXTREME CAUTION TO PREVENT CONTACT WITH SKIN. IF POWDER OR MIXED SOLUTION COMES IN CONTACT WITH SKIN, FLUSH OFF IMMEDIATELY WITH WATER. DO NOT INHALE DUST FROM POWDERS OR VAPORS FROM THE SOLUTION.
(5)
Brush magnesium touch-up solution (Method No. 202F) onto bare metal areas. Keep surface wet for one to two minutes.
(6)
Rinse in clean tap water at 50 to 90F (10 to 32C).
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