Standard Practice for Locating the Thinnest Spot in a Zinc (Galvanized) Coating on Iron or Steel Articles

Importancia y uso:

2.1 This practice provides the procedure to locate the thinnest portions of the zinc coating on newly coated items (see Appendix X1) produced to a product specification under the jurisdiction of ASTM Committee A05 and its subcommittees as designated by a purchaser in a purchase order or contract.

2.2 Limitations of the Practice: 

2.2.1 The use of this practice with zinc coating deposited through different processes (such as hot dipped, electroplated, or sprayed) requires caution in interpretation since the end point may vary considerably between different zinc-coating systems.

2.2.2 Variations in coating thickness can be due to the process by which the zinc is applied or by the geometry of the part that is coated. During hot-dip galvanizing, the coating thickness is affected by the drainage pattern of the molten zinc, while during zinc spraying (metallizing), coating thickness can be dependent on the operator's manipulation of the spray nozzle. The geometry of the part can also influence coating thickness especially during hot-dip galvanizing, where peaks and valleys on the part can cause molten zinc to build up or thin out.

2.2.3 Excluded from this practice is sheet steel from hot-dip or electrocoating lines as the sheet products are normally subject to additional forming after the coating process. Also excluded from this practice are all zinc-coated wire and wire products either continuously or batch coated before or after forming. Caution—Past research (dating from around 1963) has indicated that this practice can be influenced by operator technique. Variations can be due to the difference in hand pressure used to wipe the sample or the inability of the operator to recognize the end point.

2.2.4 This technique removes the zinc coating on the surface of the part being examined. This coating removal makes the part or article unusable after testing. This technique may not be suitable for parts fabricated into their final configuration, since they will not be acceptable after testing.

2.2.5 The results of this practice should not be used to predict the service life of the galvanized coating. Other factors such as location of the thinnest spot, orientation of the part in service, and specific environmental conditions will also affect the service life.

2.3 Examples of coated articles that can be tested are: electrical metallic tubing and rigid conduit pipe, castings and forgings, and structural steel; on special hardware, such as pole line, builder's, and farm implement hardware; bolts, nuts, screws, and other miscellaneous general hardware.

Subcomité:

A05.07

Referida por:

D3953-15R22, F2408-16R23

Volúmen:

01.06

Número ICS:

25.220.40 (Metallic coatings)

Palabras clave:

bolts; electroplated; hardware; hot dipped; nuts; screws; thinnest spot; zinc coating thickness ;