关于涂层微观检测

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8 X: g0 ]/ w) C" ^9 }First Piece Qualification (FPQ)
The purpose of the First Piece qualification is to demonstrate the ability of the chosen spray process and equipment to deposit an acceptable coating on an actual part.
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Upon approval of the MPP, the Supplier shall conduct a First Piece Qualification (FPQ).
A comprehensive evaluation for FPQ shall be required of a new Supplier, when there is a significant change in the approved MPP (as determined by MPE), or if the Supplier has not performed this process within the previous two years.


( q* T& U& `6 \/ I3 G* WThe FPQ tests shall be, as a minimum, as specified by First Piece Qualification Samples paragraph of this Specification.
The FPQ package shall include, but not be limited to the following:
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& x* l! H; N8 z% B3 EAn MPP approved by the Purchaser and/or Qualification Team prior to the initiation or during the FPQ.
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Certificate of Conformance and Certificate of Test as applicable to the External Coating Supplier.
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$ T1 s% B# B- ], UFirst Piece Qualification Samples - The number and location of all test specimens shall be defined by the Purchaser and/or Qualification Team prior to initiation of qualification and shall be stated in the approved MPP.
Minimum test sampling requirements for First Piece Qualification of TSC coated parts are defined below:
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! X- V6 [; a' z* U; `5 dCoupon material shall be carbon steel. Prepare 3 coupons. Approximate suggested size 150x70x5mm.
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: i! [9 t3 d  Y*Film Thickness Measurements shall be performed using process gage on each coupon. Prior to TSC, the gage shall be calibrated on bare grit blasted surface. TSC thickness shall be measured and recorded in at least 5 positions on each coupon. These measurements shall be compared to metallographic results, and the process gage shall be calibrated accordingly.
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*Metallography:
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Examine metallographically 3 sections per coupon, perpendicular to the coated surface, as shown in Figure 1.
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Mount and polish specimens via qualified process. (Tip: Do not use thermally cured mounting material, as it tends to damage the coating adherence to substrate.)
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6 b1 Q: P) g/ {, R# ~+ a' IPorosity shall be 5-20% per ASTM E562.
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7 G1 Y7 t* |& K8 g4 b5 iThickness measurements shall be reported as an average, and compared to process gage readings previously generated. (When measuring from micrograph, the top and bottom of coating shall be averaged.) There should be not statistical difference between the readings.
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Coating shall appear uniform in structure, free from cracking, and separation from the substrate. Coverage must be complete, with no voids to the substrate surface.
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" ^/ L; p4 m$ z/ }4 j6 ^# AInterface contamination shall be <10% of any single view at 200X per ASTM E562 (point count method).
末尾处提到的涂层微观检测怎么做呢？国内哪家单位能做该检测？并出具报告？