The Corrosion Processes Of Salix Sand-barrier And The Effect Of Anticorrosion

After a period of setting. Salix sand barriers have different degrees of corrosion, it affect the play of its ecological benefits fundamentally. The paper contrapose the corrosion phenomenon of the Salix sand barrier, through a combination of laboratory and field test methods, analysis the corrosion processes and law of Salix sand barrier, research on the the role of different environmental factors on Salix sand barrier corrosion, revealing the corrosion mechanism of Salix sand barrier, and make an antiseptic experiment by using the environmentally friendly chemical preservatives ACQ and CuAz to test the Salix sand barrier corrosion, putting forward a rational allocation with the corrosion mechanism for the actual laying the Salix sand barrier in the process of construction design, in order to extend the service life of the the Salix sand barrier, it has an important construction meaning of long-term play of Salix sand barrier protective effect. The main conclusions were shown as follows:(1) When Salix sand barrier laying period is5a. the lodging rate has reached80%. and the flexural strength loss rate of63.16%, the weight loss rate of50.87%, the effect of its prevention of wind and sand was mainly loss. The corrosion law in vertical position of Salix sand barrier was as follows:it is gradually reduced from the top to the boundary between the floor and the ground. and gradually increased to the bottom of the underground. And the corrosion of underground sections of Salix sand barrier were severe than the aerial parts. Analysis by infrared spectroscopy showed that, hemicellulose, cellulose and lignin changed during its corrosion process. And the chemical composition of Salix sand barrier was basically stable after the laying of5a. The variation of chemical composition of Salix sand barrier was the same as FTIR analysis results. Observable using scanning electron microscopy of the Microscopic Structure. the main way of corrosion of Salix sand barrier is wood-decay fungi through the expose parts of the sand barrier, enter into the parenchyma cells from the catheter. damage the cell wall. spread out. and lead to an increase of the number of larger wall cavity, then made the cell wall collapse eventually Bacteria, actinomyces. cellulose decomposition bacteria and fungus all has the function of promoting of the corrosion of Salix sand barrier.(2) Salix sand barrier corrosion more serious is in the30℃temperature. the effect of high and low temperature is relatively small:corrosion of Salix sand barrier serious with the greater soil moisture content. in acidiccan soil promote the corrosion of Salix sand barrier; and the corrosion of Salix sand barrier was serious with the increase of soil organic matter content.(3) The best treatment of ACQ preservative treatment, which retention was up to standard and corrosion-resistant reached to grade A level, is the concentration of the soaking time of2.5%for24h processing; The best treatment of CuAz preservative treatment, which retention was up to standard and corrosion-resistant reached to grade A level, is the concentration of the soaking time of2.0%for24h processing. Through the gray GM (1,1) model to predict the useful life of the the Salix sand barrier, the results showed that, the service life of the Salix sand barrier after the preservative treatment may be extended to20years. The cost of CuAz was slightly higher than ACQ. The operation cost of per hectare can all by half after treated with preservative.(4) Corrosion degree of Salix sand barrier was different in different parts of sand dunes. Corrosion of Salix sand barrier in interdune lowlands is the most severe, and corrosion in middle leeward slope is the most lightest. Corrosion of different diameter Salix sand barrier are different, the smaller the diameter the more serious corrosion. According to the parts of sand dunes and different Salix sand barrier diameter, the paper put forward following configurations:after treated by preservatives, in more serious corrosion sand parts such as interdune lowland, the bottom of leeward and bottom of windward slope laying bigger diameter Salix sand barrier:in the lightest corrosion parts such as the middle leeward slope and sunny slope, laying smaller diameter Salix sand barrier, the other slope laying middle diameter sand barrier. Such a configuration in theory, is a more reasonable, and more conducive to the effective play of Salix sand barrier.