標題: 急需發黑檢測標準！ [打印本頁] 作者: 非常 時間: 2012-4-6 13:31 標題: 急需發黑檢測標準！ 前天我公司拿兩件發黑產品去做鹽霧試驗，試驗5小時不到工件表面就有銹蝕痕跡。但是有書上說發黑產品要經過96小時鹽霧試驗才算合格的。哪位大俠比較了解這個標準的。來給我上上課。我認為發黑不可能承受96小時的鹽霧試驗的。作者: 戈壁石 時間: 2012-4-6 20:35
將發藍后的鐵片浸在2％的硫酸銅溶液里，在室溫下保持20s后取出，用水洗凈表面，如果不出現紅色接觸點，即說明發藍合格。發黑做鹽霧的標準好像沒有聽說過，5小時我覺得正常，算發黑質量不錯的。96小時有點夸張，是不是做了涂層的，樓主再了解下這個產品的要求。作者: 喬晟 時間: 2012-4-6 21:12
我也是聽說是用硫酸銅5%浸泡 沒有紅點 就算OK8 Z, ~" f; c, |5 m o
工件浸泡前用酒精擦拭去油6 Y! Z f, s! \ v& C
好象做發黑的，很少有做的好的 4 m2 f" Q0 m, G3 o" W3 N6 O) J作者: so_serious 時間: 2012-4-9 11:32 本帖最后由 so_serious 于 2012-4-9 11:35 編輯 ) i6 {) b1 U+ D' n0 Q7 s
) P& O c* [) s國家標準有三個方面的規定： " q3 H1 `' R7 Y# o1，硫酸銅點滴實驗30秒不露底色。$ C. n% u0 V; Z; n
2，草酸浸泡8分鐘不露底色。1 O @4 M# u; C$ p, i" `
3，鹽霧實驗只能作為對比，比如同類不同發黑產品做比較，一般5到6個小時算比較好的了。ps：它鹽霧實驗那么長時間的應該是電鍍做的，發黑達不到那么長時間。 . s1 x- h9 v+ ~0 B8 K. F我司專業做發黑劑，如有需要可與我聯系，15952057951作者: 龍九禪師 時間: 2012-4-9 18:52
96小時 ' K$ A# k1 ^+ L2 I( { ]9 |" x, f
連電鍍都夠嗆作者: LIAOYAO 時間: 2012-4-9 20:53 ASTM B117 7 W! f2 Z) H) a0 L; h5 P+ x* [Test Conditions 6 ]- Y7 [; O" C7 ]1 x7 FTest durations7 q: Q* ?/ K+ _. X5 V" W
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.6 q, g( t7 d! `" J' t- o0 H Appendix X.3- ^& s4 Y8 v8 E+ R* l. k
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.3 d: B+ C+ [9 K6 W
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