Hot dip galvanized nuts
Quick Details
Place of Origin:Guangdong, China (Mainland), Guangdong, China (Mainland)
Brand Name:Lanejoy, Lanejoy
Model Number:PG18
Standard:GB
Material:Carbon Steel
Surface treatment:Zinc Plated Polished
Certificate:ISO9001:2015
Color:Zinc White
Size:Customized
Price Terms:FOB,CIF,CRF,EXW and others
Delivery Time:Within 20 workdays after receive payment
Model:Pg18
Packaging & Delivery
Packaging Details
opp bag/carton
Delivery Time
7 days
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Main Markets | Total Revenue(%) |
Southeast Asia | 20% |
South Asia | 20% |
Mid East | 20% |
Eastern Europe | 18% |
Northern Europe | 10% |
North America | 10% |
Africa | 2% |
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The adverse effects of hydrogen absorption during electroplating or cleaning can be eliminated or reduced during post-plating heat treatment (usually referred to as baking). The severity of the hydrogen embrittlement hazard generally depends on the fastener's strength level and/or cold working conditions. Troiano once provided the relationship between failure time and hydrogen content and baking time. By baking, the accumulation of hydrogen in the material is reduced, and the failure time and lower critical stress levels are extended and increased. Here, the critical stress level refers to the stress level below which hydrogen embrittlement does not occur, similar to the fatigue limit.
The adequate baking time depends mainly on the hardness level of the material, the plating process, the type of coating, and the thickness of the coating. Faster (<35HRC) fasteners that have been plated at lower hardness levels should generally be baked for at least 4 hours; fasteners with the same coating but with higher hardness levels (≥ 36HRC) should generally be baked for at least 8 hours. It has been suggested that fasteners with hardness between 31 and 33 HRC should be baked for 8 hours; fasteners with hardness between 33 and 36 HRC should be baked for 10 hours; and fasteners with hardness between 36 and 39 HRC should be baked. Bake 12 hours. Fasteners with a hardness between 39 and 43 HRC should be baked for 14 hours. The formulation of the baking process should take into account both the hardness level of the fastener and the type of coating. Plating can, to a certain extent, act as a barrier to hydrogen diffusion, which will hinder the diffusion of hydrogen out of the fastener. In general, it is easier for hydrogen to diffuse out of the fastener through the loose coating than out through the dense coating. This difference between the galvanized layer and the denser cadmium plating. In order to diffuse as much hydrogen as possible out of the material, it is necessary to take a longer baking time. A. W. Grobin Jr. believes that when the thickness of the coating exceeds 2.5 μm, it will be more difficult for hydrogen to diffuse out of the steel. In this case, the galvanized layer becomes an obstacle to hydrogen diffusion. It is believed that the baking process in this case actually redistributes hydrogen to various trap locations in the material.