TT C 490D(临时修订件1) 联邦规范 有机涂层铁质表面清洁方法和预处理(1994年9月14日)

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时间:2023-03-16

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上传者:战必胜
INCH-POUND
TT-C-490D
INTSRIM AMSNDMENT 1
September 14, 199L
FSDERAL SPECIFICATION.
CLRANING METSODS FOR FERROUS
SURFACES
AND
PRSTRRA2tWNTSFOR ORGANICCOATINGS
This interim
amendment is approved by the U.S. Army Research Laboratory/
Msterials Directorate, with TT-C-490D, dated March 31, 1993.
PAGE 1
Add as new paragraph 1.2.2:
“1.2.2 chemicala.
The cleaningmaterial shall not
ccmrtainsny chemicalwhich is classifiedin the Clean Air Act Amendmentsof
1990 as a Class I or Class II oznne depletingsubstance.
PAGE 5
3..4.2.1:Delete and substitute:
“3.4.2.1
Stress
rel~ .
Parts cold worked after heat treatmentsnd parts
having a hardness of Rockwell C40 or greater sbsll be stress relievedprior to
phosphating.
PAGE 16
Table III, Under CleaningMethod; Method II, Delete:
“MIL-D-26847and MIL-T41533°
Note: Oznne depletingsolvents are no longer specifiedfor decreasingor
cleaning the surfaceof parts. Solvsnt selectionis left to the discretionnf
the msnufacturer.
Preparingactivity:
Army - MS
PrnjectMFFP-A551
AMSC NIA
DISTRIBUTIONSTATFMENT A
lofl
ARSA MFFP
Approved for public release;distributionunlimited.
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