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Why choose us?
Shanghai Pinxing's Expertise in Corrosive Environments
Shanghai Pinxing has developed specialized motor construction techniques for industries where corrosion is a primary failure mode, such as marine, chemical processing, wastewater treatment, and food & beverage. We go beyond standard paint to offer a systematic approach. For each application, we assess the corrosive agents, temperature, and pH to recommend an appropriate protection package. Our manufacturing facility includes dedicated preparation and painting booths with controlled humidity and temperature, ensuring coating adhesion and quality. We maintain stocks of corrosion-resistant materials like 316 stainless steel and can source specialized fasteners and seals to create a fully compatible system.
Validation Through Accelerated Testing
We don't just claim corrosion resistance; we verify it. Standard corrosion-resistant packages are subjected to salt spray testing per ASTM B117, typically for 500-1000 hours, to validate coating integrity. For specific chemical exposures, we can arrange testing with the actual or simulated chemical agents. This testing provides confidence that our motors will withstand the intended environment for their design life.
Popular Industries And Applications
Marine and Offshore Applications
Constant exposure to salt spray and high humidity. Motors require marine-grade coating systems, stainless steel shafts and fasteners, moisture-resistant windings, and often certified materials for seawater cooling jackets.
Chemical and Petrochemical Plants
Exposure to acidic/alkaline mists, solvents, and process vapors. Material selection is critical: 316 stainless steel frames, Hastelloy shafts for severe service, and fluorocarbon gaskets and seals. Coatings must be chemically resistant.
Pulp and Paper Mills
Highly corrosive sulfur compounds (from Kraft process) and chlorine dioxide bleach environments. Motors need special coatings and often stainless steel construction for areas near digesters and bleach plants.
Wastewater and Water Treatment Plants
Chlorinated water, hydrogen sulfide gas, and fluctuating moisture levels. Motors require epoxy-coated internals, stainless steel hardware, and IP56/IP66 enclosures to withstand washdown and corrosive atmospheres.
Food and Beverage Processing
Daily washdown with hot water and caustic or acidic sanitizers. Motors require food-grade stainless steel (304 or 316) construction, smooth crevice-free surfaces (IP66/IP69K), and FDA-compliant coatings and seals.
Hardcore Parameters
| Corrosion Level | Recommended Protection Package | Typical Materials | Coating System | Testing Standard |
| Moderate (Indoor, some humidity) | Standard Industrial | Cast Iron, Carbon Steel | Alkyd or Polyester Paint | N/A |
| Severe (Coastal, Chemical splash) | Enhanced Corrosion Resistant | Cast Iron, Coated Steel, SS Fasteners | Epoxy Primer + Polyurethane Topcoat | 500 hr Salt Spray |
| Very Severe (Marine, Immersion, H2S) | Marine / Chemical Duty | 316 Stainless Frame/Shaft, Cu-free Al | Zinc Epoxy + High-build Epoxy + PU | 1000+ hr Salt Spray |
| Food/Pharma Washdown | Sanitary / FDA Compliant | 304 or 316 Stainless Steel | Passivated or Electropolished | Cleanability Tests |
1-Minute Selection Guide
Defining the Corrosive Environment
Provide your motor supplier with a detailed description: List all **chemicals** present (including cleaning agents), their **concentration** and **state** (vapor, mist, liquid). Specify the **ambient temperature range** and **relative humidity**. Note any **abrasive conditions** (sand, dust) that could wear coatings. This information is crucial for selecting the right material and coating system.
Specifying Coating Requirements
For severe environments, include a coating specification in your purchase order. Require: **Surface Prep:** Blast cleaning to Sa 2.5 (Near-White Metal). **Coating System:** Specify primer, intermediate, and topcoat types and dry film thickness (DFT) for each layer. **Total DFT:** Specify minimum (e.g., 250μm) and require holiday detection testing. **Certification:** Request test reports for salt spray resistance (e.g., 1000 hours to ASTM B117 with no corrosion on scribe).
Customized services
Custom Material and Coating Selection Service
We offer a consultation service to determine the optimal corrosion protection strategy for your application. Send us details of your environment, and our materials engineers will recommend a package—whether it's a specific coated cast iron design, a hybrid with stainless components, or a full stainless motor. We can also arrange for test samples to be exposed to your specific conditions for evaluation.
Repair and Re-coating Services for Damaged Motors
For motors that have suffered coating damage or corrosion in the field, we offer professional repair and re-coating services. The motor is completely disassembled, cleaned, stripped, and re-coated to the original or an upgraded specification. This can restore a motor to like-new condition at a fraction of the replacement cost, extending its service life significantly.
