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| Username： GREATPROGRESS Add Time: 2013-6-4 10:05:03 [ Answer ] |
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Answer Carter:
Some metal items are finished very well, but they still get rusted. Actually there are two reasons. On one hand, we may see some items which are finished very well with their polishing, electroplating and powder coating, but the problem is that they are not processed well with de-rust, or some rust or other chemical substances are left on the iron surface. As time pass by, these substances begin to get oxidized on the layer between iron and powder coating layer or between iron and nickel plated layer, which makes the item start to get rusted. This is because iron is more active than nickel and chrome in terms of its chemical activity, iron would be oxidized first and gets rusted. On the other hand, when welding the metal items, some welding workers are not serious with their work and do not weld very well on some areas. If these areas with small holes are not covered well during powder coating, or nickel plating and chrome plating, the surrounding of these holes would lack a protection layer. Later the metal items would start to rust from inside these holes, and then spread to the outside areas and finally makes the whole item rusted.
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| Username： Carter Add Time: 2013-6-4 10:04:23 [ Answer ] |
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Why Metal Items with Good Finish Still Get Rusted?
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| Username： GREATPROGRESS Add Time: 2013-6-4 10:01:25 [ Answer ] |
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Answer Hampton:
Usually, surface treatment is referred to powder coated or chrome plated on the surface of iron. Why items produced by some factories are very easily get rusted while some manufactured by other factories would not get rusted that easily? First of all, we need to have an understanding of the techniques of powder coating. The working procedures of powder coating are as follow. 1. Alkaline cleaning to de-oil; 2. Acid cleaning to de-rust; 3. Phosphate Treatment; 4. Powder coating. Before powder coating, if the working procedures are not carefully followed, or have not clean the metal with clean water very carefully and move into powder coating, the items would get rusted very easily in the future (They will be oxidized.)
For products finished with chrome plating, they need to go through the following procedures: Alkaline cleaning, Acid cleaning, nickel plating, chrome plating. During each procedure, metal needs to be cleaned carefully with clean water; otherwise it will get rusted easily as well. But we have to pay attention to electroplated products, as its rustproof is closely related to the thickness of its electroplated layer, that is to say, the shorter the time of nickel plating, the thinner the nickel plated layer is, the rustproof of this item would be poorer. Therefore, for items of different qualities, the thickness of their electroplated layer is different.
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| Username： Hampton Add Time: 2013-6-4 10:00:40 [ Answer ] |
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Surface Finishes like Powder Coating and Chrome Plate to Prevent Rust of Metal Furniture
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| Username： GREATPROGRESS Add Time: 2013-6-4 9:59:25 [ Answer ] |
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Answer DATS:
On most occasions in furniture manufacturing, some factories use woods that are not dry enough, or rather, woods not fully dried, which make the woods only dry on the surface but wet inside. In this case, furniture during daily use or during transportation (in the container), due to the differences of surrounding temperature and humidity, moisture inside the woods would evaporate, which would result in the following problems.
First, the loss of moisture will lead to the contraction of woods. Therefore, the close joint part of furniture would turn out with small gaps and become unstable.
Second, the cracks on wood ends will result in end cracks on furniture front panels or chair legs, which turn the whole piece of furniture into a defective product.
Third, because the woods are not dry enough, the percentage of moisture content of wood surface will be lower than that of inside after the evaporation of moisture. This will cause not only cracks but deformation, with which when made into furniture, the table tops will become uneven, four legs of a chair cannot reach the floor stably, and the pull-and-push systems of drawers will loss its smoothness due to the deformation.
Fourth, if the lacquer is finished very well, the moisture inside will be stuck when it is evaporating. The result is that the moisture will accumulate on the interface between the wood surface and the paint layer. As time passed, dark spots will appear on the surface. Although you can see many of these dark spots, you cannot feel them through touch.
Last but not least, if the non-dried woods used to make sofas, it will have problems as well.
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| Username： Dats Add Time: 2013-6-4 9:58:14 [ Answer ] |
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Dangers of Making Furniture with Non-dried Wood
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