B154140
COATINGS
ELECTROLYTIC CHROMIUM PLATING ON PLASTIC PARTS
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This is a translation,the French original shall be used in all cases of ligitation Date of translation:08/04/2004 CONTENTS
1.OBJECT AND FIELD OF APPLICATION1
2.EXPRESSION ON DOCUMENTS1
3.COATING DEFINITION2 3.1.SYMBOLS2
3.2.TABLE OF THE VARIOUS COATINGS2
4.TESTS AND INSPECTION3 4.1.CRACKS OR POROSITY ON THE CHROMIUM COATING3 4.2.MEASUREMENT OF THE CHROMIUM THICKNESS3 4.3.RESISTANCE TO THERMAL SHOCK(INTERIOR AND EXTERIOR PARTS)3
4.4.RESISTANCT TO THE CASS-TEST(EXTERIOR PARTS)3 4.
5.RESISTANCE TO CLIMATIC CYCLES"GREENHOUSE EFFECT"4 APPENDIX-DETERMINATION OF CRACKS AND PORES IN THE CHROMIUM PLATING6 5.RECORDS AND REFERENCE DOCUMENTS7 5.1.RECORDS7
5.2.REFERENCE DOCUMENTS7 5.3.EQUIVALENT TO:7 5.4.CONFORMS TO:7 5.5.KEY WORDS7
1.OBJECT AND FIELD OF APPLICATION
This standard applies to electrolytic coatings on plastic parts.
The electrolytic deposits,chromium-nickel or chromium-nickel-copper may have an embrittling effect on plastic parts subjected to loads;consequently,fixings or clippings must be free of coating.
Two categories of coatings are defined according to the destination of parts:
parts exterior to the vehicle,
悍马h10报价parts interior to the vehicle.
杭州摇号登录入口2.EXPRESSION ON DOCUMENTS
The coating is designated by symbols(3.1.)followed by the reference number of this standard.
Example:PL-RE-M according to norme B154140.
Note:As well as the specifications of this standard,parts must comply accordingly with functions100or300in norme
B620100and B620200relating to plastic parts,these being expressed in conformity with that standard.
3.COATING DEFINITION
3.1.SYMBOLS
A first group of two letters indicates that the coating is on plastic:PL.
A second group of two letters indicates the category of the coating according to the destination of parts on the vehicle:
RE for exterior parts,
RI for interior parts.
A letter indicates the appearance:
M for matt,S for satin,B pour bright,etc.
Example:PL-RE-M or PL-RI-S,etc.
3.2.TABLE OF THE VARIOUS COATINGS
Unless otherwise specified on the drawing,the coatings to be used are as follows:
3.2.1.WITH COPPER UNDER LAYER
USE SYMBOL COATING THICKNESS INµm
Copper(1)Nickel(1)Micro-cracked or micro-
porous nickel
Chromium Exterior parts PL-RE25121to20,3to1,5 Interior parts PL-RI1571to20,3to1,5 Note(1):The Copper/Nickel ratio should preferably be≥2(according to the rigidity of the part).
Copper and nickel thicknesses are minimum stipulated thicknesses.
Remark:In the case of Duplex Nickel or Bi-nickel coating,the overall nickel thickness must consist of a maximum thickness
of2/3semi-bright nickel(Ductile)and a minimum thickness of1/3bright nickel(to be checked by microstructural section).
3.2.2.WITHOUT COPPER UNDER LAYER
This relates to a"special"nickel(semi-bright pillar type):
Remark:The only validated coating of this type is that formulated by the“SociétéEnthone-OMI”,it relates to the MONOLITH? process.
USE SYMBOL COATING THICKNESS INµm
Special nickel(2)Nickel(2)Micro-cracked or micro-
porous nickel
Chromium
Exterior parts PL-RE20151to20,3to1,5 Interior parts PL-RI20101to20,3to1,5
Note:(2)The Special nickel/Nickel ratio should preferably be≥2(according to the rigidity of the part).
Special Nickel and Nickel thicknesses are minimum stipulated thicknesses.
4.TESTS AND INSPECTION
Resistance to corrosion of the coating depends on the thickness of the various coatings and the number of cracks or pores on the chromium coating.
The layer of micro-cracked or micro-porous nickel enables cracks or pores of chromium deposit to be even.
吉普 suv4.1.CRACK OR POROSITY ON THE CHROMIUM PLATING
Measurement carried out by examining the chromium coating surface with an optical microscope(Method in Appendix).
4.1.1.MICRO-CRACKED CHROMIUM
Cracks on chromium deposit must be at least250cracks to one linear centimetre(Closed crack network).
4.1.2.MICRO-POROUS CHROMIUM
The porosity of the chromium deposit must be at least10000pores/cm2.
4.2.MEASUREMENT OF THE COATING THICKNESS
Use ont of the following methods:
Measurement by anodic dissolution according to test method D251056.
Measurement by microstructure according to test method D251057.
In case of dispute,the only authentic method shall be the microstructural method.
The measurement must be carried out on the significant portion of the part,to be specified on the drawing.
4.3.RESISTANCE TO THERMAL SHOCK(INTERIOR AND EXTERIOR PARTS)
This test enables the adhesion between plastic material and metal coating to be assessed.
The sample is subjected to the following heat cycle for24hours:
7hours at80°C,
30minutes at ambient temperature,
16hours at–30°C,
30minutes at ambient temperature.
Carry out four cycles for exterior parts and one cycle for interior parts.
The part is examined at the end of each cycle.
No defect such as blisters,cracks,fissures and deformation must be observed on coated parts.
4.4.RESISTANCE TO?CASS-TEST?(EXTERIOR PARTS)
Before the test,the parts must be subjected to the following heat cycle,repeated three times:?60minutes at-30°C,
15minutes at ambient temperature,
60minutes at80°C,
15minutes at ambient temperature.
After heat cycles,parts must withstand the CASS-TEST for48h,this test highlights invisible cracks caused by the thermal shock.
These tests must be carried out on separate parts.
Gradings of results after CASS-TEST are carried out according to the test method D231001.The surface of the part to be tested must be at least1dm2.If the part is too small,an adequate number of parts must be used to obtain1dm2.东风雪铁龙c2怎么样
These tests are to be carried out:
for approval:before and after simulating the fitting of the finisher onto its support,
for inspection:on the finisher.
4.5.RESISTANCE TO CLIMATIC CYCLES?GREENHOUSE EFFECT?
For interior parts,prehension of button type,knob label,opening control,…
The purpose of this test is to detect parts showing moulding and adhesion defects during the vehicle life span.
The defects highlighted are as follows:
Pitting(small craters),
ca3635Weld lines:settling of the chromium at the plastic support weld lines,
Deformations:settling of the chromium linked to shrinkage cracks on the plastic support.
Blisters:loss of adhesion between the support and the metal strip.
This cycle of a2hour total duration has been designed to simulate the day/night thermal variations of a summer’s day.
The selected values originate from thermal readings carried out on vehicles fitted with heat sensors and exposed to natural sunlight sites of Rochegude(south of France)and Arizona(United States).
Table
Relative humidity50%
Plateau5min at10°C
Up gradient50min(1,4°C/min)up to80°C
Plateau10min at80°C
Down gradient50min(1,4°C/min)down to10°C
Plateau5min at10°C
the test specimens must be parts and shall be free from any prior treatment,thermal ageing,impact,section,…
10test specimens,samples representative of a batch,shall be taken at different times of production(beginning, end and intermediate samplings).
Two levels of requirements:
Resistance :
10x24/2=120cycles for parts of a low intensity contact(knobs,styling grilles,etc.).
Resistance
20x24/2=240cycles for parts with frequent even permanent contact(knob label).
A record on the condition of the revealed defects shall be carried out every24hours.
This represents10records of information for the resistance over10days and20for the resistance over20days. The results shall be classified as follows:
1–Nothing to report
2–Showing pitting,weld line,deformation and slight blister(minor defect).
3–Worsening of the phenomenon(quite visible and unaesthetic).
4–Opening of the metal strip with danger for the client(risk of injury).
Interpretation of the results:
1and2:Conform
3and4:Do not conform
Appendix DETERMINATION OF CRACKS AND PORES IN
CHROMIUM COATINGS
Examine the cracks or pores on the surface in reflected light using an optical microscope with X100magnification (minimum).Use a micrometer eyepiece or any other similar device to indicate the distance over which cracks or pores are to be counted.
To count the number of cracks,take a measured length so that at least20cracks are counted.
To count the number of pores,take a minimum surface of0,1mm x0,1mm.
Copper deposit for determining cracks or pores
Principle:
The electrolytic copper deposit from a solution of acid sulphate,under a low current density and low voltage,is only produced on subjacent nickel which is exposed by cracks,pores and other discontinuities.
Method of operation:
Deposit the copper using a bath containing200g/l±1g/l of crystallised copper sulphate and20g/l±1g/l of sulphuric acid,with a current density of0,3A/dm2.
Immersion time1minute.
The test specimen and anode must be connected to the source of current before immersion
If the test is carried out3days after the chromium deposition,immerse the test specimen in nitric acid with a concentration
of10g/l to20g/l for4minutes at90°C before the copper deposition,in order to facilitate the highlighting of the cracked structure.
5.RECORDS AND REFERENCE DOCUMENTS
5.1.RECORDS
5.1.1.CREATION
OR:01/01/1983–CREATION OF THE NORME
5.1.2.SUBJECT OF THE MODIFICATION
C:16/01/2003–ADDITION OF§4.5.RESISTANCE TO CLIMATIC CYCLES–GREENHOUSE EFFECT B:17/07/2000–VALIDATION OF THE PROCESS WITHOUT COPPER UNDER LAYER AS PART OF THE ELECTROLYTIC CHROMIUM PLATING
5.2.REFERENCE DOCUMENTS
一汽奔腾b50报价5.2.1.PSA DOCUMENTS
5.2.1.1.Normes
B620100PLASTIC PARTS–FUNCTIONAL REQUIREMENTS
B620200PLASTIC PARTS–SPECIFIC MATERIAL REQUIREMENTS
D231001METALLIC COATINGS–CUPRO-ACETIC SALT SPRAY TEST(CASS-TEST)
D251056ELECTROLYTIC COATINGS–THICKNESS(BY ANODIC DISSOLUTION)
D251057METALLIC COATINGS–THICKNESS(MICROSTRUCTURAL SECTION)
5.2.1.2.Others
5.2.2.EXTERNAL DOCUMENTS
5.3.EQUIVALENT TO:
5.4.CONFORMS TO:
5.5.KEY WORDS
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