Judgement method for protective capability of weathering steel rust layer
A technology of protection ability and judgment method, applied in the direction of removing certain components such as weighing, measuring devices, instruments, etc., can solve the problem of not reflecting the real situation, etc., to achieve the effect of convenient use and simple test process
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Embodiment 1
[0040] Cut the two steel samples again into 3 pieces of 60×40×5cm sample blocks, do the same treatment and corrosion as the previous experiment, turn off the salt spray after 16 days of corrosion, keep the humidity in the box for 24 hours, and then gradually remove, Water absorption test, the steps are as follows:
[0041] Dehydration test:
[0042] 1) Take out the sample and put it into a dry petri dish of appropriate size, weigh it, and record it as m a , m b , the subscripts a and b represent 09CuPCrNi and bainite steel, respectively.
[0043] 2) Put the sample with the petri dish into a desiccant filled with a new desiccant for drying, and the desiccant is made of color-changing silica gel.
[0044] 3) Set a sample every 12 hours, weigh it, and record it as m ai , m bi , i is the number of samples.
[0045] 4) Use the following formula to calculate the dehydration amount M of the corrosion product per unit area of the sample ai and M bi and draw a curve as imag...
Embodiment 2
[0058] The 60×40×5cm sample block was treated and corroded in the same way as the previous experiment. After 16 days of corrosion, the salt spray was turned off, and the humidity in the box was reduced to 50% and kept for 48 hours. After that, the dehydration and water absorption tests were carried out gradually.
[0059] Dehydration test:
[0060] 1) Take out the sample and put it into a dry petri dish of appropriate size, weigh it, and record it as m a , m b , the subscripts a and b represent 09CuPCrNi and bainite steel, respectively.
[0061] 2) Put the sample into a constant temperature drying oven at 50°C, take it every 12 hours, weigh it, and record it as m ai , m bi , i is the number of samples.
[0062] 3) Calculate the dehydration amount M of the corrosion product per unit area of the sample according to the formula ai and M bi , and draw the curve as Figure 5 .
[0063] M ai = m ...
Embodiment 3
[0075] The purpose of this test was to demonstrate the applicability of this method for pure corrosion products.
[0076] Dehydration test:
[0077] 1) Scrape off the corrosion products of the sample after 16 days of salt spray corrosion, put it into a glass bottle, put it in an environment with a relative humidity of 80% provided by a constant temperature water tank, take it out after absorbing water for 12 hours, weigh it, and record it as m a , m b , the subscripts a and b represent 09CuPCrNi and bainite steel, respectively.
[0078] 2) Dry the sample in a desiccant filled with a new desiccant. The desiccant is color-changing silica gel. Set sampling every 12 hours, weigh and record as m ai , m bi , i is the number of samples.
[0079] 3) Calculate the dehydration percentage M of the corrosion product according to the formula ai and M bi , and draw the curve as Figure 7 .
[0080] M ai = m ...
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