TM-0009F-M Electrodeposited Zinc-Bad Anti-Corrosion Coatings Fasteners, Sheet, Plate
Proprietary and Confidential
Prepared by Alec Pezeshkian
Approved by Benjamin Zabik
崇福寺1Scope
This specification establishes standards of quality, performance and delivery condition for zinc and zinc-alloy anti-corrosion coatings applied to vehicle components by electrodeposition. Coated components may also posss any of a number of condary surface treatments intended to confer lubrication, alter tribological characteristics, al the bacoat or provide color. This specification encompass a variety of zinc or zinc-alloy bacoat chemistries, delineated as grades below.
The materials specified herein are suitable for interior and exterior applications, per the guidelines below. Common substrates include internally- or externally-threaded ferrous fasteners and non-threaded ferrous parts requiring protection in corrosive environments. Zinc- or zinc-alloy-plated parts should not be ud in conjunction with polyamide (nylon) 6 or 6,6. Coatings specified herein are not recommended for components of tensile strength greater than 1000 MPa.
Bad on application, each specified coating must meet the affiliated criteria agreed upon by Tesla Motors and its suppliers. Deviations from the requirements cited herein must be agreed upon by Tesla Motors and the appropriate supplier.
2References
ASTM B117 ASTM D543 ASTM D610 ISO 554 ISO 1463 ISO 2177
ISO 2178
ISO 2819
ISO 3497
ISO 4042
ISO 9227
ISO 10683
ISO 16047
ISO 17025
SAE J2334
3Requirements
General Guidelines. Several coating grades are specified by this standard, sorted by chemistry and corrosion resistance. Alloying element concentrations must not exceed the limits noted in Table 1.
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All coating systems specified per this document must be free of hexavalent chromium.
Unless otherwi noted, coatings meeting this specification must maintain functional integrity between –50 C and +180 C.
All samples to be tested must be conditioned for at least 24 hours at +23±2 C and 50±5% RH prior to testing per ISO 554.
Default values of temperature and humidity are taken to be +23±2 C and 50±5% RH. If not specified otherwi, such conditions may be assumed.
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All prescribed values of temperature and humidity are target values; variations within ±2 C and ±5% RH of the values are permissible, unless otherwi noted.
Exposure time periods carry a tolerance of ±5 minutes. If a specimen must be transferred from one test environment to another within a given cycle, this lap may not last longer than one minute.室字组词
A minimum of three specimens must meet the requirements of each test criterion for this
specification to be considered met.
3.1 Pre-treatment. Alkaline degreasing and/or shot-blasting are recommended methods of surface pr非常大脑
eparation. Shot-blasting is not recommended for components with captive washers or internally-threaded parts. If acidic cleaning methods must be ud, only acids with suitable inhibitors are allowed; exposure time to the acid solution, as well as time between exposure and final coating, shall be kept to a minimum. Acidic cleaning must be followed by heat treatment for hydrogen effusion.
Weld ams shall be removed of slag and silicate residues that may hinder uniform coating.
3.2Post-treatment. A number of surface treatments may be incorporated into a component “topcoat”, as specified by the part drawing. The topcoat must completely cover the electrodeposited bacoat without irregularities in appearance. Exterior components with electrodeposited bacoats require aftertreatment.
PASSIVATION.May be colored or uncolored. Must not contain Cr(VI).
SEALANTS. Increa corrosion resistance. May incorporate lubricants. Maximum 2 µm thickness. Must not affect coating functional properties.
ORGANIC FINISHES/PAINTS. Increa corrosion resistance. May provide color. Must not fill recess.
3.3 Appearance. Substrates to be plated must be visually smooth and defect-free, without scratches, cracks, porosity, traces of rust or scale. The coated specimen must be free of scratches, cracks, pores, flakes, or blisters and shall not be slippery or tacky to the touch. Coating thickness shall be uniform, with no undercoated or overcoated surfaces such that part performance is compromid. The coating shall be free of foreign contaminants and shall leave no visible residue upon manipulation. Color requirements may be indicated on the part drawing.
3.4 Thickness. Unless otherwi specified, total coating thickness may be no less than 8 µm. Refer to ISO 4042. Coating thickness must be verified by any of the following test methods: ISO 1463, ISO 2177, ISO 2178, ISO 3497. Thickness measurements are taken over flat faces. Thickness values encompass bacoat and topcoat. For measurement in bulk process, coating thickness may be correlated to part weight. The coating thickness on bearing surfaces shall not exceed 25 µm. The coating thickness applied to threads is limited by the basic thread size per ISO 4042 (tolerance h or H). After coating, parts must gauge with a referee nut or fastener.
无尽天灯3.5 Corrosion Performance. Minimum corrosion performance requirements are to be verified by neutral salt spray testing per ISO 9227 or ASTM B117 as specified in Table 1. Coatings shall meet the minimum exposure requirements specified without the appearance of “white corrosion” (oxidation
of the coating material) or “red corrosion” (oxidation of the ba metal).In the former ca, a sl ightly pale, white appearance (or “blush”) must not necessarily be construed as evidence of white corrosion.
In ries production, such testing shall be conducted regularly to maintain statistical process control.
3.6 Torque-Tension Characteristics(Fasteners M6 and larger). Coated M10 x 1.5 surrogate test bolts, procesd alongside production parts, shall be subject to torque-tension testing per ISO 16047. The tightening speed shall be 30±3 RPM and the tension load shall be 28.3 kN. The test shall be conducted with uncoated test nuts and test washers. The three-sigma torque range shall lie within 40 —56 N-m.
3.7 Coating Durability. Coatings must tolerate normal handling, storage, and installation conditions
(including bending, compression and tension) without loss of adhesion, chipping or flaking. When processing, the u of soft-handling equipment is recommended.
3.8 Hydrogen Embrittlement. Components hardened to a surface rating of HRC 35 or core rating
of HRC 32, or tho of strength > 1000 N/mm2, that are expod to elevated hydrogen concentratio
ns or treated through hydrogen-generating process must be handled per ISO 4042 Annex A.
I NITIAL S OURCE A PPROVAL R EQUIREMENTS (FOR COATING QUALIFICATION ONLY).
3.9 Temperature Resistance. The coated specimen must withstand continuous heating at 180 C
for 3 hours without evidence of white or red corrosion. The coated specimen must also withstand continuous exposure to 260 C for 30 minutes followed by rapid water quenching to room temperature without evidence of blistering or peeling of the coating per ISO 2819.
3.10 Accelerated Corrosion Resistance. Testing shall be conducted per SAE J2334 with no
evidence of red corrosion (ASTM D610 grade 8 or better) according to the following schedule:
I.G RADE 10:75 CYCLES.
II.G RADE 11:50 CYCLES.
III.G RADE 12:30 CYCLES.少年的勇气
3.11 Cathodic Protection. The cathodic protection capacity of coatings shall be assd by
neutral salt spray testing per ISO 9227 or ASTM B117. Specimens shall be scribed to the ba metal (with scratch no wider than 0.5 mm) with no evidence of red corrosion following 96 hours of exposure.
申论范文精选3.12 Adhesion. Coatings shall not exhibit peeling, flaking or blistering after 96 hours of exposure to
95% RH at +40 C. Within 30 minutes of removal from the environmental chamber, a tape adhesion test per ISO 10683 (7.5) shall be conducted; there must be no significant coating transfer to the tape surface. Coating transfer may indicate inadequate cure.
3.13 Chemical Resistance. The coated specimen must withstand exposure to the following
chemicals per ASTM D543 Practice B, conducted at room temperature. There must be no discoloration or visible evidence of property loss.
I.W INDSHIELD WASHER FLUID (50% METHANOL SOLUTION)
II.B RAKE FLUID (DOT 3)
III.E NGINE COOLANT (50% ETHYLENE GLYCOL SOLUTION)
IV.S OAP SOLUTION 2.5% WITH ECE TEST SOAP 77 BY H ENKEL
V.A MMONIA (GLASS CLEANER) SOLUTION 5%
VI.U NIVERSAL CLEANER WITH VINEGAR
