MIL-STD-1622B(SH)
and cleaning agent are removed. Components shall be disassembled to achieve maximum cleanliness. Components which are visibly clean may eliminate the preclean step and proceed directly to the final clean, verification, and rinse step specified in 5.3.5.
(b)Light corrosion or tarnish on brass and bronze components can be removed by soaking in a weak acid such as white vinegar. After soaking, rinse with water to remove the white vinegar.
(c)Rinsing of corrosion resistant metals such as stainless steel, nickel-copper (monel), and copper-nickel may use grade C water provided temperatures are less than 140oF. At higher temperatures, or where municipal water supplies leave undesirable deposits, grade B water shall be used.
(d)When using multiple precleaners, rinse between each different precleaner application to prevent any harmful reaction which may occur when different cleaning agents are combined.
(e)When removing difficult soils such as heavy waterproof greases, silicone greases, and fluorinated greases, most precleaners will have limited effectiveness if used without agitation in a soak or ultrasonic tank. Hand scrubbing is often the best alternative.
(f)Components shall be dried if the delay between completion of precleaning and start of final cleaning could result in the formation of rust or other oxides. Otherwise, no specific drying step is required prior to final cleaning.
5.3.5 Final clean, verification and rinse. Final cleaning, verification and rinsing shall be accomplished as follows:
(a)Fully immerse components in an ultrasonic tank or parts washer filled with NOC at 140 to 160oF or TSP at 160 to 180oF.
(b)Energize the ultrasonic tank or parts washer for 5 to 15 minutes.
For software such as o-rings and valve seats, limit exposure to a
maximum of 10 minutes.
(c)If the final cleaner is NOC, obtain a sample of no less than 200 mL
of used NOC, and verify organic cleanliness as specified in 5.14.2
and in 5.14.3.2. If either analysis fails, replace the NOC and
repeat the final clean, verification, and rinse process. Do not
wait for analysis results before proceeding to rinsing as
specified in 5.3.5(e).
(d)If the final cleaner is TSP, obtain a 500 to 600 mL sample of the
used TSP and verify organic cleanliness by analyzing for
hydrocarbons or NVR as specified in MIL-STD-1330, or by an
approved EPA Oil and Grease and Total Petroleum Hydrocarbon test
methods such as EPA Method 1664, or equal. The acceptance
criteria is 15 ppm maximum. If the analysis fails, replace the
TSP and repeat the final clean, verification, and rinse process.
Do not wait for analysis results before proceeding to rinsing as
specified in 5.3.5(e).
(e)Remove the component(s) from the ultrasonic tank or parts washer
and immediately rinse with grade B water in an ultrasonic tank,
batch tank, and/or flowing water. The rinse water shall be no less than 110oF for NOC and 120oF for TSP. Continue rinsing until the effluent rinse water pH measured as specified in 5.14.4 is 8.0 or less, but rinse for no less than 30 seconds. The preferred
rinse process consists of two rinses using an ultrasonic or batch tank as the first rinse followed by a batch tank or flowing water as the second rinse.
(f)Obtain a sample of no less than 200 mL of the effluent rinse water and verify particulate cleanliness as specified in 5.14.3.1. If the analysis of 5.14.3.1 fails, replace the rinse water if applicable and repeat the final rinse step.
19
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business