Quality Testing
I. About the experiment
Experimental purpose:
The use of salt spray test equipment created by the artificial simulation of salt spray environmental conditions to assess the product or metal materials corrosion resistance of environmental testing.
Experiment content:
Our company does the salt spray test for sodium chloride neutral smoke test (NSS), is the earliest emergence of the most widely used in the field of an accelerated corrosion test method.Rapid corrosion test method. It uses 5% sodium chloride brine solution, the solution pH adjusted in the neutral range (6 ~ 7) as a spray with the solution. Test temperature are taken 35 ℃, the required salt spray settlement rate of 1 ~ 2ml / 80cm² - h between.
Experiment length:
Surface hot-dip galvanizing, plastic-coated, PVC and other products are required to 120h no body structure rust; surface plating products generally need 24-48h.
II. The object of observation
White rust:
zinc, zinc-iron, zinc-nickel alloy plating and then NSS experiment after the corrosion of salt spray will slowly appear white rust, (NaCl will also precipitate white crystals.
(Phenolphthalein test solution can be used to distinguish.) White rust represents the surface layer began to be affected by corrosion, but does not represent the parts themselves
received corrosion of the material.
Red rust:
Iron corrosion produced by iron oxide for red embroidery, red rust means that the surface of the parts to protect the coating has been penetrated, the subject material exposed
Hot dip galvanized iron plate anchor salt spray test report | |||||||
| Product | Danforth anchor, iron plate anchor | Surface treatment | Hot dip galvanized | ||||
| Test duration | 96h | Test date | 2020.9.14-9.18 | ||||
| Observation interval | 24h | Salt spray type | NaCl | ||||
| 24h |   | 24 hours surface zinc layer remains intact, no rust, surface precipitation of a small amount of white rust. | |||||
| 48h |   | 48 hours surface zinc layer remains intact, without red rust and increased white rust generation. | |||||
| 72h |   | 72 hours still intact, zinc layer precipitation white rust increased, appear solid white spot, still no red rust appeared. | |||||
| 96h |   | 96 hours zinc layer intact, no red rust spot on the surface, white rust aggravated, solid white spot formed, no any red rust appeared. | |||||
| Conclusion | Hot dip galvanized iron plate anchor 96 hours salt spray test: the overall performance was good, with no breakage or red rust in the zinc layer, but more white rust precipitated on the surface, due to the generation of white rust accelerated by the presence of aluminum in the zinc layer. | ||||||
Galvanized folding anchor salt spray test report | |||||||
| Product | 1.5kg folding anchor | Surface treatment | Galvanized | ||||
| Test duration | 96h | Test date | 2020.9.21-9.25 | ||||
| Observation interval | 24h | Salt spray type | NaCl | ||||
| 24h |  | 24 hours surface zinc layer remains intact, no rust | |||||
| 48h |  | 48 hours surface zinc layer remains intact, precipitation of a small amount of white rust, no red rust | |||||
| 72h |  | 72 hours surface zinc layer remains intact, and a small red rust spot appeared on the anchor fin. | |||||
| 96h |  | 96 hours good zinc layer, no increase in rust spots and no more white rust | |||||
| Conclusion | Galvanized folding anchor 96 hours salt spray test: good surface, without a lot of rust, no damage to the surface zinc layer. | ||||||
Salt spray test report | |||||||
| Product | Box anchor | Surface treatment | Hot dip galvanized | ||||
| Test duration | 96h | Test date | 10.25-10.31 | ||||
| Observation interval | 24h | Salt spray type | NaCl | ||||
| 24h |   | 24 hours white rust began to appear on the surface, white rust was evident on the tie rods and no red rust appeared. | |||||
| 48h |   | 48 hours white rust on the surface increases and red rust begins to appear on the end of the rivet. | |||||
| 72h |   | 72 hours white rust on the surface continues to increase, forming a stable white spot, and the red rust spot on the rivet is obvious. | |||||
| 96h |   | 96 hours white rust continued to increase, except for the rivet part, the zinc coverage was intact and the material was not exposed. | |||||
| Conclusion | Hot Dip Galvanized box anchor 96 hours salt spray test: the surface has a better resistance to rust and corrosion. Hot-dip galvanizing will increase the precipitation of white rust because of the thicker zinc layer and the process of adding aluminum to the plating to increase the brightness. In addition to the rivet part without zinc layer part, the rest of the zinc layer is complete, the material is not exposed. | ||||||
Salt spray test report | |||||||
| Product | 1.5kg red painted folding anchor | Surface treatment | Spraying plastic | ||||
| Test duration | 120h | Test date | 2021.5.20-2021.5.31 | ||||
| Observation interval | 24h | Salt spray type | NaCl | ||||
| 24h |   | There is no change in the surface and the coating is not broken or discolored in any way. | |||||
| 48h |   | The vast majority of the surface remains intact and the coating is complete, with some areas of the coating appearing lighter in color. | |||||
| 72h |   | Most of the coating on the surface is intact, and some of the coating that has been discolored is starting to show the coating peeling off, and the peeling off exposes the material without rusting. | |||||
| 96h |   | The discolored area increases, the peeling area increases, and the exposed part of the material begins to rust. The rusted area is less than 2% of the total area. | |||||
| 120h |   | The surface discolored areas did not change significantly, and the rusted areas did not increase further, and the coating remained mostly good. | |||||
| Conclusion | The performance of the anchor remained good under 120 hours of salt spray test conditions, with no large changes affecting the use of the anchor. performance, the using did not receive any influence. Surface coating will appear speckled peeling, peeling will produce rust spots, the main area is the movable part of the fit, the casting of the fit part, the area is less than 1/50; and will not accelerate the overall rate of peeling because of partial peeling. | ||||||
Hot dip galvanized four claws anchor salt spray test report | |||||||
| Product | Four claws anchor | Surface treatment | Hot dip galvanized | ||||
| Test duration | 96h | Test date | 2020.9.21-9.25 | ||||
| Observation interval | 24h | Salt spray type | NaCl | ||||
| 24h |  | 24 hours the surface zinc layer remains intact without red rust, and white rust begins to precipitate on the surface of the zinc layer. | |||||
| 48h |  | 48 hours zinc layer intact no red rust, the surface white rust continues to increase. | |||||
| 72h |   | 72 hours most of the zinc layer remained good, with slight red rust at the weld and very serious white rust, which had formed solid white spots on the surface. | |||||
| 96h |  | 96 hours the vast majority of the zinc layer remained good, with no increase in rust spots and a surplus of zinc thickness. | |||||
| Conclusion | Hot dip galvanized four claws anchor 96 hours salt spray test:The zinc layer is intact, no serious rusting, only one rust spot appears at the weld, the zinc layer thickness is rich, so the white rust has been increasing. | ||||||
