In the field of shipbuilding, selecting suitable polysilazane coatings requires comprehensive consideration of multiple factors. The following is a detailed introduction for you:1、 According to the usage environment of different parts of the ship
shell plating
The outer hull of the ship is in direct contact with seawater and has been subjected to long-term immersion, wave erosion, salt spray corrosion, and exposure to sunlight. So for this area, a polysilazane coating with excellent resistance to seawater corrosion, erosion, and good weather resistance should be selected. For example, some high crosslinking and special corrosion-resistant functional groups in polysilazane products can form a stable and dense protective film in strong corrosive environments such as seawater, effectively blocking the invasion of corrosive substances such as chloride ions, preventing steel rusting and corrosion, and extending the service life of the outer panel. At the same time, its erosion resistance ensures that the coating is not easily peeled off under the continuous impact of waves, maintaining a good protective effect.
Internal compartments of ships
The environment inside the cabin of a ship is diverse, and different cabins have different requirements. For compartments storing flammable materials, fire resistance is the primary consideration, and it is necessary to choose a polysilazane coating with excellent fire resistance. This type of coating can quickly expand to form an insulation layer when exposed to open flames, delaying the spread of fire and buying time for personnel evacuation and firefighting. For compartments that are prone to moisture, such as kitchens and bathrooms, emphasis should be placed on moisture resistance. Priority should be given to selecting polysilazane coatings that can effectively block water vapor infiltration and prevent mold growth to ensure that the cabin structure and internal facilities are not damaged by moisture. In addition, for some equipment compartments, such as distribution rooms, attention should be paid to the insulation and anti-static performance of coatings to avoid safety issues caused by electrical failures.
ship deck
The deck is subject to personnel movement, friction during cargo loading and unloading, seawater erosion, and various chemical substances such as oil pollution and cleaning agents. Therefore, suitable polysilazane coatings for decks should have high wear resistance, chemical corrosion resistance, and good anti slip performance. For example, adding wear-resistant fillers to the polysilazane coating can enhance its surface hardness and reduce wear caused by personnel and cargo activities; At the same time, through special surface treatment, it has a certain roughness, providing necessary anti slip function and ensuring the safety of personnel walking and working on the deck.
2、 Consider the construction process requirements
Compatibility of coating methods
If the shipbuilding industry tends to use spraying for large-scale construction, such as ship hull panels and large cabin wall panels, it is necessary to choose a polysilazane coating with moderate viscosity, good flowability, and easy to uniformly atomize and spray through spraying equipment. The viscosity after blending is generally controlled at around 20-30 seconds (coating -4 cups) (for common spraying methods such as high-pressure airless spraying), which ensures that there will be no problems such as clogging of the spray gun, sagging, or uneven spraying during the spraying process. For some complex structural parts that are difficult to apply by spraying, such as corners, welds, pipelines, etc., if brushing or rolling coating is planned, it is required that the coating material can adhere well to the brush or rolling brush, and be easy to spread and level during the coating process, so that the coating is evenly covered without obvious brush marks or uneven thickness.
Adaptability to curing conditions
Different shipbuilding site environments and production schedules have different requirements for the curing conditions of polysilazane coatings. Some shipbuilding sites have heating and curing equipment and high requirements for coating performance. Therefore, it is possible to choose polysilazane coatings that require heating and curing (such as heating to 150-200 ℃ and maintaining for a certain period of time) to fully exert their best performance. After heating and curing, the hardness, wear resistance, corrosion resistance, and other properties of these coatings will be significantly improved. But if the construction site conditions are limited and can only rely on natural curing, then it is necessary to choose a polysilazane coating that can dry and cure well at room temperature (generally 15-30 ℃, relative humidity 40% -70%), and the performance after curing can also meet the corresponding protection requirements, to avoid poor coating performance due to inability to meet curing conditions.
3、 Based on cost budget
material cost
The price of polysilazane coating products varies due to differences in formula and performance. Some high-performance polysilazane coating materials with multiple special protective functions are relatively expensive, such as products that add rare metal elements or special additives to enhance anti-corrosion, fireproof and other properties. When choosing, it is necessary to weigh the importance and protection requirements of each part of the ship to determine whether it is worth investing in the use of such high-performance coatings at a higher cost. For critical and long-term harsh environments such as ship hull panels, it may be necessary to increase material costs and select high-quality coatings to ensure the overall life and safety of the ship; For some relatively secondary and mild environment interior areas of the cabin, relatively affordable polysilazane coating products can be chosen to meet basic protection needs while controlling costs.
Construction Cost
The construction cost includes the costs incurred due to factors such as the complexity of the construction process and the construction period. If the selected polysilazane coating has strict construction requirements, such as multiple coating processes, special curing treatments, and high requirements for the construction environment, the corresponding construction costs will increase, including labor costs, equipment usage costs, and environmental control costs. On the contrary, coatings with relatively simple construction and easy curing conditions can effectively reduce construction costs. So when choosing, it is necessary to comprehensively consider the price of the coating itself and the construction cost, ensuring that the total cost is within a reasonable and controllable range while meeting the requirements of ship protection. 

Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150K.       
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.