CHROMATE CONVERSIONZINC
Zinc protects steel by providing a physical barrier as well 
as cathodic protection for the underlying steel. Simply stated, Zinc sacrifices itself to protect the steel. Zinc is commonly specified by electronics, automotive, water works, construction, and on-shore fastener industries. The advantages of Zinc include good corrosion resistance, formability, aesthetics, high strength, light weight, and relatively low cost. Southwestern Plating offers barrel, rack, automated, and manual Zinc plating to service our customers.
| Chemical Symbol: | Zn |
| Atomic Number: | 30 |
| Atomic Weight: | 65 |
| Density: | 7.14 g/cm3 |
| Melting Point: | 787 °F (419 °C) |
| Boiling Point: | 1665 °F (907 °C) |
 |
| ASTM B633 | |
| Type I | No chromate treatment |
| Type II | With colored chromate treatment (yellow or other) |
| Type III | With colorless chromate treatment (clear) |
| Type IV | With phosphate coating |
| Type V | With colorless passivate |
| Type VI | With colored passivate |
| Class 25 | (SC-4) .001 thickness |
| Class 12 | (SC-3) .0005 thickness |
| Class 8 | (SC-2) .0003 thickness |
| Class 5 | (SC-1) .0002 thickness |
| QQ-Z-325 | |
| Type I | No chromate treatment |
| Type II | With colored chromate treatment (yellow, clear, or other) |
| Type III | With phosphate treatment |
| Class 1 | .0005 thickness |
| Class 2 | .0003 thickness |
| Class 3 | .0002 thickness |
 |
1312 Halpern, Houston, Texas,
77009
P.O. Box 8837, Houston, Texas, 77249
PH: 713-223-1331 Fax: 713-223-2909
Email: info@swplating.com
P.O. Box 8837, Houston, Texas, 77249
PH: 713-223-1331 Fax: 713-223-2909
Email: info@swplating.com