Thermal spray coating is known as the “protective armor” for industrial components, widely used in machinery, aerospace, energy and other fields. It not only provides wear-resistant protection for easily worn shafts and blades, but also builds a corrosion-resistant barrier for pipelines and containers in corrosive environments. Additionally, it can realize functions such as heat insulation and electrical conductivity for high-temperature components, thereby extending the service life of equipment.

If thermal spray coating is the “armor”, then the metallographic section of the thermal spray sample is the “quality inspection magnifying glass”, which is a key link in coating quality control. Through metallographic section preparation and microscopic observation, the uniformity of coating thickness, the bonding interface state with the substrate can be accurately detected, microscopic defects such as pores and cracks can be identified, and the integrity of the coating microstructure can be analyzed. This not only verifies the rationality of the spraying process and avoids potential application risks in advance, but also provides intuitive data support for coating performance optimization, ensuring that the “protective armor” can truly withstand industrial tests!

Standard Metallographic Sample Preparation Procedures for Thermal Spray Ceramic Coatings:

1️⃣ Rough Grinding: Use P400 metallographic sandpaper and grind until the sample surface is flat

2️⃣ Fine Grinding: POS polishing pad + 9μm PD-WT polishing fluid

3️⃣ Rough Polishing: SC polishing pad + 3μm PD-WT polishing fluid

4️⃣ Intermediate Polishing: ET polishing pad + 1μm PD-WT polishing fluid

5️⃣ Fine Polishing: ZN polishing pad + 0.05μm SO-T401 polishing fluid

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