Anticorrosion treatment will more or less affect the mechanical properties of wood, resulting in loss of wood strength. However, this effect is related to a series of factors, including wood decay, size, pretreatment before anticorrosion (especially wood moisture content), anticorrosion treatment process (pressure, temperature, time, etc.), post-treatment of wood, secondary drying, whether the anticorrosive wood needs to be reprocessed, and the use environment.
Usually, when anticorrosive wood is used as a load-bearing structural material, the strength value of the original wood should be adjusted to reduce 0~10%. When anticorrosive wood is used as a non-load-bearing structural material, the strength of the wood after anticorrosion treatment can be ignored.
However, if the preservatives, preservative treatment technology and wood processing are appropriate, the strength reduction caused by preservative treatment is limited. Some advanced or developed countries have specific requirements for wood preservative treatment technology to prevent or reduce the loss of wood strength caused by preservative treatment (especially water-based preservatives).
If ordinary non-corrosive wood is used and used in a humid environment, the loss of wood strength caused by decaying insects will be greater. For example, when the mass loss of wood due to decay reaches 5% to 10%, the strength of wood will generally decrease by 20% to 80%.
The harm of wood decay is that the initial decay is difficult to detect and perceive. When decay is observed, the loss of wood strength is often more than 10%.
So from the perspective of structural safety, the use of antiseptic wood is safer than ordinary (non-antiseptic) wood.
The paint and finishing properties of wood are related to the type of wood preservative used. Wood treated with oil-soluble cresu oil or antiseptic oil has poor paintability and cannot be painted. If painting is required, wood treated with antiseptic oil should be weathered for 1 to 2 years before finishing and painting, and generally only oil-soluble translucent colorants can be used. On the other hand, wood treated with antiseptic oil is generally only used for industrialpurposes such as railway sleepers and electric poles, which are not within the sight of people’s lives and do not come into contact with people, and do not require painting or finishing.
For wood treated with water-based preservatives, as long as the preservatives and preservatives are properly treated, it will not affect the performance of paint and finishing. In many cases, wood treated with water-based preservatives requires surface treatment. The reasons are as follows: First, water-based preservatives are mostly used in civil occasions, or in the landscape and vision of people’s lives, and surface finishing can make the wood more beautiful; second, surface finishing can reduce the weathering of wood and maintain the beauty of wood for a longer time.
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