1、WORLDWIDEENGINEERINGSTANDARDSTest Procedure GMW16073Engine Oil Humidity Corrosion Test Copyright 2013 General Motors Company All Rights ReservedAugust 2013 Page 1 of 41 ScopeNote: Nothing in this standard supercedes applicable laws and regulations.Note: In the event of conflict between the English a
2、nd domestic language, the English language shall takeprecedence.1.1 Purpose. With This Procedure, the corrosion performance of engine oil can be tested. It is, for example, arequirement during engine and vehicle shipment. The selected sheet material is similar to oil pan baffles andstamped oil pan m
3、aterials.1.2 Foreword. Not applicable.1.3 Applicability. Engine oil.2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Specifications.EN 10130 ISO 6270-22.2 GM Standards/Specifications.None2.3 Additional References. CG37063 Resources
4、3.1 Facilities.3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a validcalibration label.3.1.2 Alternatives. Alternative test facilities and equipment may also be used. However, all measuringvariables as specified in this standard shall be determined
5、 correctly with respect to their physical definition.3.2 Equipment.3.2.1 Condensation climate with Alternating Humidity and Air Temperature (AHT) according to ISO 6270-2.3.2.2 Digital camera with a resolution of 3 Megapixel minimum.3.3 Test Vehicle/Test Piece. Deep-drawing sheet steel according to E
6、N 10130 DCO4 B with root meansquare surface roughness of | 1.0 m and plasma cleaned.Metal sheet dimensions: 210 mm x 150 mm x | 0.8 mm with a bore diameter of 8 mm. To ensure high testrepeatability the use of metal sheets from sources listed in CG3706 are mandatory.3.4 Test Time.Calendar time: 7 day
7、sTest hours: 136 h + 48 h weekend break timeCoordination hours: 10 h3.5 Test Required Information. Not applicable.3.6 Personnel/Skills. Laboratory trained personnel.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking p
8、ermitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16073 Copyright 2013 General Motors Company All Rights ReservedAugust 2013 Page 2 of 44 Procedure4.1 Preparation. If necessary, the metal sheets can be looped with one hole prior to preparation.4.2 Conditions.4.2.1 Environme
9、ntal Conditions. Not applicable.4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Suchrequirements shall be specified on component drawings, test certificates, reports, etc.4.2.2.1 According to ISO 6270-2, AHT.4.2.2.2 Four (4) metal sheets per oil.
10、4.2.2.3 Five (5) test cycles.4.2.2.3.1 Each test cycle: 8 h at (+40 3) C and 100 % humidity followed by 16 h at an ambient temperatureof (+18 to +28) C and ambient humidity.4.3 Instructions.4.3.1 Thoroughly wipe all metal sheets with a tissue soaked in petroleum naphta (+60 to +95) C, until there is
11、no more swarf visible on the tissue.4.3.2 Completely immerse each metal sheet for 5 minutes in the test oil.4.3.3 Let the oil drip off for 16 h by placing the metal sheets with an angle of 60 to the horizontal.4.3.4 Wipe off excessive oil with tissue at metal sheet bottom edges before humidity stora
12、ge.4.3.5 Store the metal sheets in an alternating condensation water atmosphere according ISO 6270-2, AHT andtest conditions described in paragraph 4.2.2.4.3.6 After 3 cycles the test metal sheets can remain at an ambient temperature of (+18 to +28) C andambient humidity for additional 48 h to cover
13、 a weekend break.Example of test cycle sequence:Day Test stepsTuesday Preparation of metal sheets, oil immersion and 16 h oil drip offWednesday 8 h at (+40 3) C, 100 % humidity + 16 h at ambient temperature and humidityThursday 8 h at (+40 3) C, 100 % humidity + 16 h at ambient temperature and humid
14、ityFriday 8 h at (+40 3) C, 100 % humidity + 16 h at ambient temperature and humiditySaturday & Sunday 48 h at ambient temperature and humidityMonday 8 h at (+40 3) C, 100 % humidity + 16 h at ambient temperature and humidityTuesday 8 h at (+40 3) C, 100 % humidity + 16 h at ambient temperature and
15、humidityWednesday Rating and photographs4.3.7 Rate and report each metal sheet after the last cycle according to the rating grades in paragraph 5.2. Themetal sheet cut edges (3 mm) should be excluded from the rating.4.3.8 Photograph all metal sheets within 2 h after completion of test with a digital
16、 camera of3 Megapixel minimum resolution.5 Data5.1 Calculations. Not applicable.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16073 Cop
17、yright 2013 General Motors Company All Rights ReservedAugust 2013 Page 3 of 45.2 Interpretation of Results. See Tables 1 and 2.Table 1: Definition of Corrosion Rating GradesGrade Appearance0 No corrosion1 Traces of corrosion: max five (5) corrosion spots(with a diameter of 1 mm maximum)2 Slight corr
18、osion: Corrosion 5 % of the surface3 Medium corrosion: Corrosion (5 to 20) % of the surface4 Strong corrosion: Corrosion of 20 % of the surfaceTable 2: Final Corrosion Grade Rating Note 1Rating Number of Sheets with Grades0 3 to 4 sheets with Grade 0,maximum 1 sheet with Grade 11 2 to 4 sheets with
19、Grade 1,maximum 1 sheet with Grade 22 2 to 4 sheets with Grade 2,maximum 1 sheet with Grade 33 2 to 4 sheets with Grade 3,maximum 1 sheet with Grade 44 2 to 4 sheets with Grade 4Note 1: In case of sheet ratings that are not covered in Table 2, the test shall be repeated.5.3 Test Documentation. The t
20、ested oil shall be identified by a clear formulation code. The rating of eachsingle metal sheet after the fifth cycle and the overall rating after the fifth cycle shall be reported. Color picturesof all metal sheets shall be attached.6 SafetyThis standard may involve hazardous materials, operations,
21、 and equipment. This standard does not propose toaddress all the safety problems associated with its use. It is the responsibility of the user of this standard toestablish appropriate safety and health practices and determine the applicability of regulatory limitations priorto use.7 Notes7.1 Glossar
22、y. Not applicable.7.2 Acronyms, Abbreviations, and Symbols.AHT Condensation climate with alternating humidity and air temperature8 Coding SystemThis standard shall be referenced in other documents, drawings, etc., as follows:Test to GMW16073Copyright General Motors Company Provided by IHS under lice
23、nse with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16073 Copyright 2013 General Motors Company All Rights ReservedAugust 2013 Page 4 of 49 Release and RevisionsThis standard originated in September 2
24、008. It was first approved by Global Fuels and Lubricants inMarch 2009. It was first published in March 2009.Issue Publication Date Description (Organization)1 MAR 2009 Initial publication.2 AUG 2013 Revised in new templateParagraph 3.3: Sheet metal was according to GMW2M-ST-S-CR3Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
