标题: 急需发黑检测标准！ [打印本页] 作者: 非常 时间: 2012-4-6 13:31 标题: 急需发黑检测标准！ 前天我公司拿两件发黑产品去做盐雾试验，试验5小时不到工件表面就有锈蚀痕迹。但是有书上说发黑产品要经过96小时盐雾试验才算合格的。哪位大侠比较了解这个标准的。来给我上上课。我认为发黑不可能承受96小时的盐雾试验的。作者: 戈壁石 时间: 2012-4-6 20:35
将发蓝后的铁片浸在2％的硫酸铜溶液里，在室温下保持20s后取出，用水洗净表面，如果不出现红色接触点，即说明发蓝合格。发黑做盐雾的标准好像没有听说过，5小时我觉得正常，算发黑质量不错的。96小时有点夸张，是不是做了涂层的，楼主再了解下这个产品的要求。作者: 乔晟 时间: 2012-4-6 21:12
我也是听说是用硫酸铜5%浸泡 没有红点 就算OK5 h6 C- [" A( @* T+ P
工件浸泡前用酒精擦拭去油1 L3 D4 ` ?! y# z4 y' _6 X5 q
好象做发黑的，很少有做的好的6 H) }1 F5 m5 K6 Q 作者: so_serious 时间: 2012-4-9 11:32 本帖最后由 so_serious 于 2012-4-9 11:35 编辑 & P% M9 R& A; Z. Q. e% b3 y6 r' o1 i4 I5 P) @
国家标准有三个方面的规定：. |! }/ g- g8 R. C% Q7 R( p
1，硫酸铜点滴实验30秒不露底色。 & t1 }" R& g8 ]9 ~) X. z' H2，草酸浸泡8分钟不露底色。 n2 ~7 E: \4 g- P1 p6 T8 @
3，盐雾实验只能作为对比，比如同类不同发黑产品做比较，一般5到6个小时算比较好的了。ps：它盐雾实验那么长时间的应该是电镀做的，发黑达不到那么长时间。& S" ]# F$ @! H: h) k: P
我司专业做发黑剂，如有需要可与我联系，15952057951作者: 龙九禅师 时间: 2012-4-9 18:52
96小时 ! ?0 o" N4 w6 K: p) g) U8 I5 p
连电镀都够呛作者: LIAOYAO 时间: 2012-4-9 20:53 ASTM B117# _0 r v2 g+ [; R/ w" S+ ] Test Conditions/ k' }# i3 U0 H Test durations: U) ^1 L4 ] t" Z
Test durations are typically in 24-hour increments and can range from 24 hours to 5000 hours (where salt fog exposure is a part of a more complex test method, exposure time can be as little as 15 minutes.) Except for sample rotation and daily monitoring of collection rates, the cabinet should remain closed for the duration of the test. ( [3 W& H( w# A F* z1 EAppendix X.3) X- D( O# `) v
In 1987, Appendix X.3 was added to ASTM B117 to suggest the use of mass loss panels as a means for checking the corrosive conditions in a given salt spray chamber. The procedure calls for SAE 1008 commercial grade cold-rolled carbon steel panels, measuring 76 x 127 x 0.8 mm, to be cleaned, weighed, and placed in the chamber in the proximity of the collector funnels. After an exposure time of 48, 96, or 168 hours, the panels are removed, cleaned, and re-weighed. When conducted on a regular basis, the final mass loss number can be used as a tool for monitoring consistent corrosive conditions within the chamber. The frequency of conducting this test should be determined by the user, but common practice suggests the test be conducted monthly, or whenever any change occurs which might affect the cabinet - such as a change of location, salt, water, operators, etc.4 ^3 `' S) r# l, I2 S
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