CETP00.00-L-467實(shí)驗(yàn)室大氣循環(huán)腐蝕鹽霧標(biāo)準(zhǔn)2

Fig. 4  Example of open and well drained fixtures for flat test panels (left) and minimum recommended stacking distance of panels (right)
圖4 適用于平板試樣的開(kāi)放且排水暢通的夾具（左圖）；建議至小板間距（右圖）
 
 
5.1.4 Duration of test:  The number of test cycles shall be determined by the specification covering the component or object being tested. When not specified, the test period shall be agreed by the requester and the corrosion department.
5.1.4  試驗(yàn)持續(xù)時(shí)間：試驗(yàn)循環(huán)次數(shù)應(yīng)由試樣零部件或試樣相關(guān)要求決定。如果沒(méi)有要求，應(yīng)由申請(qǐng)?jiān)囼?yàn)的一方和負(fù)責(zé)研究腐蝕的部門(mén)商定試驗(yàn)周期。
 
5.1.5 Control before test start:  Run and monitor the test cycle at least a 24 h period before starting the test, provided not already in continuous operation.
5.1.5 試驗(yàn)開(kāi)始前的控制：假如持續(xù)運(yùn)行尚未開(kāi)始，在試驗(yàn)開(kāi)始之前先運(yùn)行并監(jiān)控試驗(yàn)循環(huán)至少24小時(shí)。
 
5.1.6 Start and end time of test: The test is only allowed to be started just before the first precipitation (Table I Step1A) in the weekly scheme, i.e. at the end of the "weekend" constant temperature/humidity phase. The test is ended at the end of the weekend humidity exposure.
5.1.6 試驗(yàn)的啟動(dòng)時(shí)間和結(jié)束時(shí)間：本試驗(yàn)只允許在一周計(jì)劃中的一次噴灑（見(jiàn)表1，步驟1A）之前啟動(dòng)，即“周末”恒溫恒濕階段結(jié)束時(shí)。試驗(yàn)在周末加濕曝露階段結(jié)束。
 
5.2 TEST EXPOSURE CONDITIONS  試驗(yàn)曝露條件
There are three basic exposure modes in the daily test scheme:
每日試驗(yàn)計(jì)劃分三種基本曝露模式：
 
1. A continuous wet phase at 25± 2°C where the test objects are exposed to a 0.5% NaCl solution. The wet condition is maintained by intermittent spray exposure and with a temperature control without drying, or with the humidity control set high enough to not cause any practical drying.
1.  25± 2°C持續(xù)濕潤(rùn)階段，在此階段試樣曝露到0.5%的氯化鈉溶液中。通過(guò)間歇噴灑曝露和溫度控制（不干燥），或調(diào)節(jié)濕度控制（足以防止物體干燥），試樣的濕潤(rùn)狀態(tài)得以保持。
 
2. A two-step transition from wet to controlled humidity climate.
2. 從濕潤(rùn)到受控濕度環(huán)境的兩步過(guò)渡。
 
3. A period under constant temperature/ humidity control; 50 ± 0.6°C and 70 ± 3% RH. This is also the condition during weekend.
3. 恒溫恒濕控制周期：50 ± 0.6°C，70 ± 3% RH。這也是周末的環(huán)境狀態(tài)。

Table 1.  Climate program, step by step in automated mode
表1  環(huán)境表，自動(dòng)模式的各個(gè)步驟

 
* Provided proceeding from step 3a or 3b  假如從3a或3b開(kāi)始進(jìn)行

Fig. 5 Workday (Mon.-Fri.) test cycle  圖5 工作日（一至五）試驗(yàn)循環(huán)
 

 
Fig. 6 Complete weekly program.  圖6 完成每周計(jì)劃
 
5.2.1 Operations within the wet phase at 25±2°C:  
5.2.1  在25±2°C濕潤(rùn)階段的操作
 
Exposure to 0.50±0.05% NaCl solution shall be performed at least in the beginning, middle and at the end of the 6 h wet phase.  
在6小時(shí)濕潤(rùn)階段的開(kāi)始、中端和結(jié)束時(shí)至少各進(jìn)行一次0.50±0.05%的氯化鈉溶液曝露。
 
In automated mode, the first event may consist of a longer period of spray (1a - up to 10 minutes) in order to cool the samples and the chamber more efficiently from the 50°C, 70% RH condition. If all test operations are performed within the same climate chamber, it is essential to follow-up with efficient cooling after the first spray event, in order to reach a temperature below 30°C within the first 30 minutes of the wet phase (1b). After such cooling, which implies some drying, it is recommended to have another short spray event to assure that the solution on the panels have the stipulated concentration (1a' in Table 1/ Fig. 5)  The final targeted temperature of 25±2°C shall be reached within the first hour.
在自動(dòng)模式下，N1次噴灑時(shí)間會(huì)長(zhǎng)一些（1a-10分鐘），以使試樣和試驗(yàn)箱從0°C, 70% RH的狀態(tài)下更有效地冷卻。如果所有試驗(yàn)操作都是在同一個(gè)試驗(yàn)箱中進(jìn)行，N1次噴灑后的有效冷卻非常重要，需要在濕潤(rùn)階段（1b）的頭30分鐘內(nèi)將溫度降到30°C以下。冷卻過(guò)后（意味著一定程度的干燥），建議進(jìn)行一次短時(shí)間噴灑以保證板上的溶液達(dá)到規(guī)定的濃度（圖5/表1中的1a）N1個(gè)小時(shí)內(nèi)達(dá)到*終的目標(biāo)溫度25±2°C。
 
In an exposure case where the spray is applied manually into a stay-open chamber, or the samples are moved to another chamber or lab bench for spraying at wet phase exposure, cooling within the stipulated time is usually not a problem. Note that the spraying conditions described in 3.3.1 shall apply. During the remaining time of the wet phase (1c), the samples must not dry significantly. This is accomplished by securing that the temperature control is maintained without significant removal of humidified air. If the wet phase is performed in a trough on a bench or in an unheated chamber, it may be sufficient to just keep the panels in a closed volume between the spray events. In the fully integrated test condition, the climate control can be set to 25°C, 95% RH, which secures against any significant drying, without the risk of supplying humidity, which might occur if the humidity is set to e.g. 99% RH.  The short spray event after approximately 3 h (1a') renews the wet film on the samples and secures against drying. The final spray event (1a') is to assure consistent starting conditions when entering the transition to controlled humidity climate.
假如是在敞開(kāi)的試驗(yàn)箱里進(jìn)行手動(dòng)噴灑或者是將試樣轉(zhuǎn)移到其他試驗(yàn)箱或試驗(yàn)臺(tái)上進(jìn)行濕潤(rùn)階段曝露，在規(guī)定時(shí)間內(nèi)冷卻一般不成問(wèn)題。注意，應(yīng)當(dāng)按照第3.3.1段所述的噴灑條件進(jìn)行。在濕潤(rùn)階段（1c）剩余的時(shí)間里，不能讓試樣干燥。為保證這一點(diǎn)，可以保持溫度而不大幅減少加濕空氣。假如濕潤(rùn)階段是在試驗(yàn)臺(tái)上的水槽中進(jìn)行，或者在未加熱的試驗(yàn)箱中進(jìn)行，僅僅在噴灑的間歇期間保持密封也許就足夠了。在綜合的試驗(yàn)條件下，環(huán)境控制可以設(shè)置成25°C, 95% RH。這樣可以保證試樣不干燥，畢竟當(dāng)濕度設(shè)置為99%RH時(shí)加濕可能失效。大約3小時(shí)（1a’）后，需進(jìn)行短時(shí)間噴灑以加強(qiáng)試樣表面的保濕層，避免干燥。*后的噴灑（1a’）是為了在進(jìn)入控制環(huán)境濕度的過(guò)渡階段保證初始狀態(tài)一致。
 
Note 1: The spraying scheme in Table 1 does not have to be literally followed, provided there is a spraying period at the beginning, middle and end of the 6-h wet period and the total amount of precipitation follows paragraph 3.3.1.
注意1：假如在6小時(shí)濕潤(rùn)階段的開(kāi)始、中段和結(jié)束各進(jìn)行一次噴灑，而且噴灑總量符合第3.3.1段的要求，則不必逐一按照表1中的噴灑計(jì)劃操作。
Note 2: Continuous spraying with atomizing salt-fog type nozzles is not an option.
注意2： 不得使用霧化鹽霧噴頭進(jìn)行持續(xù)噴灑。
 
5.2.2 Transition to controlled humidity conditions:  
5.2.2 過(guò)渡到受控濕潤(rùn)狀態(tài)：
For both fully and partly programmable procedures, ramp up from 25°C and nominally set 95% RH to 40°C, 95% RH during 30 min, which means that wet conditions will prevail (2a). Slowly dry the wet corroding surfaces going from 40°C, and set 95% RH to 50°C, 70% RH for 2 h (2b). At the final controlled climate conditions there shall be no visible wetness on any corroding surface and the actual values must be within the set allowed limits. The reason for this two-step procedure with a quick temperature rise followed by slow drying at comparably high humidity is to favor drying by diffusion rather than drying by convection, since the latter varies considerably between different types of cabinets.  Such variability is likely to have considerable impact on the test result.
對(duì)于完全或部分可編制的程序，30分鐘內(nèi)從25°C，讀數(shù)為95%RH，加溫到40°C, 95% RH，意味著濕潤(rùn)狀態(tài)會(huì)占上風(fēng)（2a）。2小時(shí)內(nèi)（2b）將濕潤(rùn)腐蝕的從40°C，95%RH，干燥到50°C, 70% RH。在*終控制的環(huán)境狀態(tài)下，腐蝕表面不應(yīng)再有水跡，而且實(shí)際數(shù)值必須在允許范圍內(nèi)。采取兩步操作，即快速升溫然后在相對(duì)較高的濕度下緩慢干燥，是因?yàn)樵谟跀U(kuò)散干燥比對(duì)流干燥好，后者在不同的試驗(yàn)箱里差別很大。這種差別有可能?chē)?yán)重影響試驗(yàn)結(jié)果。
 
Note 3: The transitions 1b and 2a/b are essential to insure consistent test quality at the actual chamber specimen load. If the chamber humidity sensor is not positioned close to the samples, independent monitoring in the sample test plane should be accomplished according to section 3.1
注意3： 1b和2a/b的過(guò)渡對(duì)于保證試驗(yàn)質(zhì)量的一致性是必不可少的。如果試驗(yàn)箱內(nèi)的濕度傳感器并不靠近試樣，根據(jù)3.1章節(jié)所述，應(yīng)在試樣測(cè)試平面上配備獨(dú)立監(jiān)控。
 
5.2.3 Constant climate conditions of 50°±0.6°C, 70±3% RH will prevail until a 24 h cycle is fulfilled, i.e. for 15.5 h. (3a) These constant exposure conditions are prolonged during "weekends", i.e. the last 48 h of the week cycle (3b) after finalizing the 5^th "workday" cycle.
5.2.3  恒定狀態(tài)50°±0.6°C, 70±3% RH將持續(xù)至24小時(shí)循環(huán)完成，即持續(xù)15.5小時(shí)（3a），而在“周末”計(jì)劃中將持續(xù)更長(zhǎng)時(shí)間：即完成第5個(gè)“工作日”循環(huán)后，周循環(huán)（3b）持續(xù)48小時(shí)。
 
5.3 AFTER EXPOSURE
5.3.1 Storage: For corroded samples of steel base or aluminum it is important to evaluate the samples no more than a week after finished test, if kept in ambient conditions. Otherwise test specimen should be kept in desiccators.
5.3 曝露后
5.3.1 保存：對(duì)于鐵制或鋁制腐蝕試樣，如果保存在一般環(huán)境中，應(yīng)在試驗(yàn)完成一周內(nèi)進(jìn)行對(duì)試樣進(jìn)行評(píng)估，否則應(yīng)將試樣保存在干燥器中。
 
5.4 QUALITY CONTROL
5.4.1 Workday control:
Check that the monitored temperature and humidity values are in accordance with set values.
5.4    質(zhì)量控制
5.4.1 工作日控制：
檢查確認(rèn)溫度值和濕度值符合設(shè)定值
 
5.4.2 Weekly control:
Check that the spray nozzles deliver the intended uniform spray pattern and that the spray rig works properly.
Check that the salt solution is within 0.50 + 0.05 % by wt. of NaCl solution, most conveniently with a conductivity meter (8.2 mS/cm). Use a reference standard solution. With the stipulated water quality (paragraph 2.2) pH is not subjected to control.
Check storage tanks and other supply sources.
 
5.4.2 周控制：
檢查確認(rèn)噴頭能均勻噴灑，噴灑裝置運(yùn)轉(zhuǎn)正常。
通過(guò)稱(chēng)量氯化鈉溶液，檢查確認(rèn)鹽溶液在0.50 + 0.05 %范圍內(nèi)，便捷的方法是使用電導(dǎo)儀(8.2 mS/cm)。使用參考標(biāo)準(zhǔn)溶液，規(guī)定的水質(zhì)（見(jiàn)第2.2段）PH不受控制。
檢查儲(chǔ)存罐和其他供應(yīng)源。
 
5.4.3 Bimonthly control:
Monitor the climate with an independent control device (paragraph 2.5) during test operation by placing the device in the chamber test plane just after the last spray of a wet phase and remove it before the first spray of the next wet event.
5.4.3  兩月一次的控制：
在試驗(yàn)過(guò)程中使用獨(dú)立控制設(shè)備監(jiān)控環(huán)境（見(jiàn)第2.5段），即在LAST后一次濕潤(rùn)階段噴灑過(guò)后將該設(shè)備放到箱里的試驗(yàn)平臺(tái)上，然后在下一次加濕噴灑之前撤走。
 
5.4.4 Annual calibration:
Clean and service the complete equipment
Monitor the climate with an independent control device at the three different settings given in paragraph 3.1.
Check that the salt solution spray downfall is within specification. See Attachment 10.1
5.4.4 年度校正：
         清潔并維修整套設(shè)備
         在第3.1段所述的三個(gè)不同設(shè)定狀態(tài)下，用獨(dú)立控制設(shè)備監(jiān)控環(huán)境
         檢查確認(rèn)鹽溶液的狀態(tài)符合規(guī)定。見(jiàn)附件10.1。
 
 
5.5 DEVIATION HANDLING
5.5.1 Deviations, general:  Any deviation during the test shall be recorded and its consequence on the test result shall be discussed with the test requester.
5.5    處理誤差
5.5.1 一般誤差：
試驗(yàn)過(guò)程中出現(xiàn)的任何誤差都應(yīng)記錄下來(lái)，事后與試驗(yàn)申請(qǐng)方討論誤差對(duì)于試驗(yàn)結(jié)果的影響。
 
5.5.2 Test interruption:  In case of a temporary chamber failure, an intended holiday stop or at annual service of the equipment:  Store the test samples at room temperature (18-28°C) at 50-60% RH. for at most a week. This storage conditions will keep established corrosion cells at minimum activity without irreversibly quenching the corrosion activity, which may result from dry storage.
5.5.2 試驗(yàn)中斷:
由于試驗(yàn)箱臨時(shí)故障、節(jié)假日停機(jī)或?qū)υO(shè)備進(jìn)行年度維修而中斷試驗(yàn)：將試樣儲(chǔ)存在室溫(18-28°C)，相對(duì)濕度50-60% RH的環(huán)境下，*多一周。在這種儲(chǔ)存條件下，已經(jīng)生成的腐蝕細(xì)胞的活性可以控制在至低水平，而不會(huì)產(chǎn)生由于干燥儲(chǔ)存形成的對(duì)腐蝕活性的不可逆抑制。
 
 
 
6.0 Acceptance Criteria
6.1 Acceptance Criteria is determined by the Corrosion Engineering Department of Ford Motor Company.
6.0 接收標(biāo)準(zhǔn)
6.1 接收標(biāo)準(zhǔn)由福特汽車(chē)公司腐蝕工程部決定。
 
7.0 presentation of data
7.1 Present all pertinent information agreed upon with requester.  This may include number of cycles completed, pictures taken, special sample preparation, or positioning of the samples.
7.0 呈送數(shù)據(jù)
7.1 呈送與試驗(yàn)申請(qǐng)方商定的所有相關(guān)數(shù)據(jù)，包括完成的循環(huán)次數(shù)、照片特殊試樣準(zhǔn)備或試樣位置。