极速3D彩票平台主营:Taber耐磨试验机,马丁代尔摩擦试验机,PV1210盐雾循环试验箱,ATLAS氙灯老化试验机,38DLPLUS超声波测厚仪
站内搜索
联系我们
电  话: 021-32535039
传  真: 021-32535039
手  机: 13472521719
网  址:
联系人: 谢文清
邮  箱: xiewenqing2000@126.com
地  址: 上海市嘉定区德富路1198号803室太湖世家国际大厦
VDA233-102

VDA233-102

 品牌:德国  型号:SKBWFR1000A-TR/CF25  加工定制:否  
 材质:玻璃钢  温度范围:-25-70 ℃ 测量范围:-25-70  
 测量对象:汽车金属涂料橡胶  工作室尺寸:1500x800x900 mm 重量:800 kg 
产品特性:VDA233-102,VDA233-102,VDA233-102,VDA233-102
产品简介:品牌:德国 ;型号:SKBWFR1000A-TR/CF25 ;加工定制:否 ;材质:玻璃钢 ;温度范围:-25-70 ℃;测量范围:-25-70 ;测量对象:汽车金属涂料橡胶 ;工作室尺寸:1500x800x900 mm;重量:800 kg
极速3D彩票平台
详细介绍:

VDA233-102 Cyclic corrosion testing of materials and components in automotive construction


VDA233-102汽车结构中金属和元件的循环腐蚀试验

5 Execution

5.1 Test conditions – Test procedure The test duration is to be stipulated upon on a case by case basis. The typical test duration is six full test cycles (6 weeks). If necessary, the test duration can be changed until it is possible to draw conclusions concerning the corrosion behaviour.

Interim assessments have proven useful to determine the progression of corrosion.

 

A full test cycle lasts 7 (Fig. 1) days and consists of:

3 times = 24h cycle A (Fig. 2; see also 7.2) without freezing phase, with 3 h salt spray phase (1 % NaCl solution)

3 times = 24h cycle B (Fig. 3; see also 7.2) without freezing phase, without salt spray, including assessment of specimens (or walk-around inspection)

1 time = 24h cycle C (Fig. 4; see also 7.2) with freezing phase, without salt spray

Fig.1: The placement of specimens in the test chamber shall be carried out exclusively during the
first cycle B of the evaluation phase. This also applies for the removal of the specimens.

Fig.: 2: 24 h-cycle A, with 3 h salt spray phase (1 % NaCl)

 

Fig.: 3: 24 h-cycle B without freezing phase, without salt spray, with evaluation phase

 


Fig. 4: 24 h-cycle C, with freezing phase, without salt spray

 

5.2 Test interruption

Interruption of the test or opening of the test chamber is only permitted during the evaluation phase (cycle B). The test chamber may not be switched off during this time.

No interruption of the salt spray phase is permitted. Longer interruptions of the cyclic climate phases are to be avoided; if unavoidable, they must be mentioned in the test report.

 

5.3 Placing specimens in the chamber

The specimens shall preferably be positioned in the chamber at an angle of 65° to 75° relative to the horizontal with the side to be tested uppermost. Components are to be positioned as agreed with the principal, preferably in the orientation in which they will be installed. The specimens (or components) may not contact each other or shield other specimens from the salt spray.

 

When using two separate test chambers for the salt spray phase and the cyclic climate phase, the specimens may not be allowed to dry-out when being transferred from one chamber to the other.

Vehicle components or special corrosion test plates may also be used as specimens for the test. In the case of components, special care shall be taken to ensure that salt solution does not pool on the specimen, as this will affect the test conditions (climate). If this cannot be avoided, such pooling must be removed at least once a week.

 

6 Monitoring of the test system

To ensure reproducibility of the results ob-tained by one test system, or rather the comparability of the results from different test systems, it is recommended to monitor these tests regularly.

6.1 Monitoring using mass-loss specimensSubstrate, dimensions, and preparation of the mass-loss specimens are defined in DIN EN ISO 9227.

The mass-loss specimens are positioned at 65° to 75 ° relative to the horizontal. The

back-side is to be protected from corrosion attack, for example with removable adhesive tape.

The removal of the corrosion products is defined in ISO 8407.

The evaluation of the mass-loss specimens is done by the gravimeteric method, by weighing the specimens after the test. The mass-loss specimens weighed with an accuracy of 1 mg. The mass-loss (difference of mass) is to be divided by the area of the exposed surface, to get the mass-loss with respect to one square meter

 

If the average mass-loss of at least 3 mass-loss specimens after three cycles testing time is 900 ± 220 g/m², the testing chamber is working satisfactorily.

 

Note:

The fractional values for relative humidity result from the specified condition that the temperature must be ramped up (35 - 50) °C at a heating rate of 0.125 K/min and that changes in relative humidity take place at a rate of 0.1 %/min for ramps of [(100-50); (70-90;

(90- 95)] % and 0.33%/min for ramps of (50-70) %. If in doubt, the data given in section 7.2 shall apply. When temperature ramps are passed through during periods of constant relative humidity, deviations of – 8 % to + 5 % relative humidity are accepted.


 
极速3D彩票平台
联系人:谢文清   联系电话:021-32535039   手机:13472521719   传真:021-32535039   联系地址:上海市嘉定区德富路1198号803室太湖世家国际大厦
   技术支持:   
极速3d彩票是正规的吗 - 极速3d彩票计算方法 - 极速3d彩票技巧 - 极速3d彩票能玩吗 - 极速3d彩票官网 - 极速3d投注技巧 - 极速3d是哪里的彩票